Maf Sensor Reading Too High

Intake Air Temp reading 6°F too high. Many people will replace the air-fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty Mass Air Flow (MAF) Sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate. Some manufacturers incorporate the Intake Air Temperature (IAT) sensor as part of the Mass Air Flow (MAF) sensor (Air Flow Meter). When you suspect a mass air flow sensor as the culprit for setting a fuel trim fault code, check when the fault code was set. The computer will still adjust the air/fuel mixture to compensate. In VAGCOM it gives readings at idle (Block 003/004) of between 2 and 3 g/s (which is normal), but then for no reason it will shoot up and give a reading of up to 15g/s, this is when the car stalls and cuts out. The ECM compares the actual MAF sensor voltage signal to a predicted MAF value. On GM MAF sensors, there are a couple of quick checks you can do for vibration-related sensor problems. Basically, it indicates that the Oxygen Sensor (O2) reading is above the normal range, This sensor for a long time has had too high a voltage and does not switch over again. I think the MAF sensor is knackered, despite being only 4 months old. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. Is Your Sensor Still Not Working? If these steps have not helped you identify and isolate the problem, there may well be a problem with your sensor. Hi all, I have had yet another idea for wind speed and direction sensing. The 528 in this thread would seem to be out of range assuming the reading was taken at idle and in relatively the same conditions as the. 300 volts or above 0. Do this after the VE table has been corrected. AutoZone Repair Guide for your Driveability And Emission Controls Electronic Engine Controls Mass Air Flow (maf) Sensor too close to high voltage wires such as. On the other hand though The napa MAFI was using seems like it was reporting too low of air flow at idle (big + trims), and way too high of air flow in the top two learning ranges (big - trims). In MAF mode, the truck ran a little better but still rough, and in Speed Density it would still stall out. 3 Ohms on my multi meter. com FREE DELIVERY possible on eligible purchases. I just got a scan tool that reads live data. Someone else thinks maybe the MAF is getting condensation The dealer thinks the MAF is OK. You should put your year/model/engine info in your signature. A method for controlling a particulate matter sensor heater, comprising: operating the heater to burn off soot accumulated on the sensor; and adjusting a heater level based on sensor output generated during heater operation, the heater level adjusted based on the sensor output after a decrease from a peak soot level reading, with the heater active from before the. 56 Vane Air Flow (VAF) or Mass Air Flow (MAF) sensor high - VAF MAF Transmission Oil Temperature sensor too high - Transmissions. 9 V then look for something other than the sensor causing a lean condition. Car came to us from another shop. 5 volts with engine running (R). MAF sensor position and placement, as well as correct MAF scaling in the tune, is critical to making a MAF tune work well. If your meter has a "min-max" feature, you can also use it to check the range of oxygen sensor readings - which is actually a better test. Pressure/Boost Sensor (G31) - Signal too High. A bad mass air flow sensor in a vehicle makes starting difficult and affects the performance of the engine because he engine-control unit uses data from the MAF sensor to balance the fuel ratio the injectors deliver to the engine. This table is used to lookup the Airflow (g/sec) value for a given frequency and ultimately calculate the Airmass (g/cyl. Found an OEM one on ebay for $70, no problems since. The HO2S control hits the -25 limit with the new MAF at idle only. What to do: Put in clean air filter. Therefore, on average you are expected to pay $200 to $400 in total for a mass air flow sensor replacement. Speedometer reading MUCH too high. Diagnosing a plugged converter is fairly easy, but diagnosing converter efficiency requires tapping into the OBD II system with a scan tool to check for codes and to. With the ignition OFF you can measure the voltage on sensor wire and it should be 1 volt or less. It measures the quantity of air passing into the engine. It is normal to see some spikes in CO during acceleration, but unusually high CO readings indicates that the fuel mixture is too rich. Throttle response will be non-existant but you should be able to get up to speed as a check of the MAF. March 23, 2017 Thanks to our Program member from: Mississauga, On. Negative values indicate that the engine is running too rich and oxygen sensor control is therefore making it more lean by reducing the amount of time that the injectors are open. Some mechanics will recommend to clean the sensor every time you replace the air filter. 3 Ohms on my multi meter. The maf says it's at like 2500 grams per second. Once in a while we may encounter a total failure of a MAF sensor, one that is, perhaps, short circuited or internally open. 1 grams/second, should not exceed 4. I'm stumped so it looks like forking out for an Auto Elec. Trouble Code 23 indicates that the Manifold Air Temperature sensor is reporting abnormally low readings. The 0² usually comes on line, 10 seconds after a cold start. for reading Autoblog. 0 63,000 miles came in after failing mot on high emissions - no faults when checked by scanner and live data. Like the MAP sensor, if a trouble code sets for a MAF sensor error, some things must first be checked before replacing the sensor. 08 - does it seem low? Using your 0. Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P0172. The Powertrain Control Module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. The maf says it's at like 2500 grams per second. LONGFT1 values that differ greatly from LONGFT2 values would rule out concerns that are common for both banks (for example, fuel pressure concerns, MAF sensor, etc. Output Frequency (High): This table is used to calibrate the MAF sensor in the high frequency range. Ok so just put in a brand new mass air flow sensor and it still coding out po102 which is low mass air flow current. 9 mv is one of the ground. Both conditions could keep it from firing up. but from what i gather, you are telling me the new maf i had on my car, the readings were too high, but in reality the car ran perfect with good power and great fuel economy. I am not sure what the 1gs reading are but the Signal wire should be around 0. Basically, it indicates that the Oxygen Sensor (O2) reading is above the normal range, This sensor for a long time has had too high a voltage and does not switch over again. The IAT sensor input and the mass airflow (MAF) sensor input signals are used by the PCM to calculate fuel delivery and. Would this be a symptom of a. At ignition on the DPF sensor should be 0. Now everything was making sense! This truck learns alcohol content by watching fuel trim, MAF readings, and injector pulse width. While driving if you go up hill something shuts off then it will get to low power, switching the car off and turn it back on the power is restored. This error code is often associated with P0100, P0101, P0102 and P0104. Many people will replace the air-fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty Mass Air Flow (MAF) Sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate. Error Code P0103 is defined as MAF (Mass Air Flow) sensor or VAF (Volume Air Flow) sensor high input. Changing gears at too high of an rpm. I got a diagnostic at autozone and got the code p0171 system too lean bank 1. If the sensor is connected properly, both electrically and to the intake manifold, use a scan tool or voltage meter and vacuum gun to check MAP sensor output. This article will explain what the sensor does, and why it can make such a huge difference to the running of the car. 02 sensors were reading. Air changes its density with temperature and pressure. Unless your Maf sensor is bad. FACTORS AFFECTING CALIBRATION. Sometimes I've noticed if I drive the car hard and then idle, the sensor pulls in a lot more air (6g/s+) Both bank O2 sensor 1 voltages oscillate normally between 0-0. When i open the throttle, the reading DROPS (for example at 2500 RPM it shows around 260 mbar) With the engine OFF and ignition ON it reads exactly the barometric (atmospheric) pressure of our city which is about 870 mbar. MAF sensor problem- If the engine idles, but will not respond with a smooth idle, disconnect the MAF sensor and tap the throttle and see if it responds better. You sure can, (if it runs at all) , usually the ecu will run the engine on a factory pre-established fuel map; BUT,most cars,if the MAP(manif absol. The computer tried to compensate, but since resolution is impossible, it sets the code. but from reading in this forum and the HP Tuner forum, it seems I have that reversed. 8/s at idle, increases with revs). MAP Issues. When the mass air flow sensor is faulty it will have low grams per second readings. If there are no visible problems, then the mechanic will conduct a circuit test using a multimeter with a digital display to get the sampling rate and sensor range readings to determine whether the output of the MAF sensor is too high. In MAF mode, the truck ran a little better but still rough, and in Speed Density it would still stall out. Even timing can affect combustion efficiency and thus BLMs. The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate. The MAS consists of the air volume sensor, the intake air temperature. Leaks in the air induction system or intake manifold can cause the MAF sensor to produce false readings, so can faulty wiring. MAF This is the most important sensor. If you have a backflow issues (high backpressure) or even a timing issue where the valves are not opening and closing at the correct time (slack chains, jumped timing), your MAF sensor readings will reflect this as well. By george1861, June I have removed it. gives me a code that signal is too high. Depending on the make and model, your car uses either a hot-wire (the most common) or a hot. I let the car cool overnight with the hood open and then compared IAT, ambient temp. Tap lightly on the sensor and note the meter reading. for reading Autoblog. No fluctuations at all. The air intake system from the air filter. If the problem persists the front oxygen (O2) sensor may need to be replaced. You sure can, (if it runs at all) , usually the ecu will run the engine on a factory pre-established fuel map; BUT,most cars,if the MAP(manif absol. The fuel trim data is within the usually accepted range of 0 ±10%. Some vehicles have both a MAP and a MAF sensor. The MAF sensor measures the volume of air that enters the engine and relays the information back to the ECU. P2073 Manifold Absolute Pressure/Mass Air Flow – Throttle Position Correlation at Idle. Direct voltage measurements using probes at the PCM terminals themselves were showing slowly fluctuating NEGATIVE voltages. me encontrÈ con este listado de codigos en la red, y como suele suceder que luego hace falta aber, pues se los compartoquizas ya alguien lo haya aportado, pero como para mi es informacion nueva se los paso por si alguien los llega a necesitar. Page 1 of 6: Symptoms of a BAD IAT Sensor. The Mass Air Flow Sensor is one of the main electronic components of the fuel delivery system. will change MAF air flow readings, but the readings should fall within a given range at the same engine speed/temp. The source voltage should be a constant 12 volts, and the ground side of the maf should have. Temperature Sensor Gradient Too High - Mass air flow meter assembly. 9 V then look for something other than the sensor causing a lean condition. The MAF sensor works on the hot film principal. Low fuel pressure will have the same effect on the learn process as high alcohol content in the fuel. How to Test a MAF or MAP Sensor With a Multimeter. In this article, I'll show you how to test the mass air flow (MAF) sensor on your GM 3. If there are no visible problems, then the mechanic will conduct a circuit test using a multimeter with a digital display to get the sampling rate and sensor range readings to determine whether the output of the MAF sensor is too high. I've seen MAF sensor reading too LOW, but never too high. Engine coolant temperature (ect) sensor reading too cold. So my MAF sensor is reading extremely low. 9, sensor 2 voltages steady around 0. So if the maf is reading too high/too low then egr/boost fault. Spoke to the local Subaru service department and was told this is within the variance. At operating temperature the oxygen sensor signal varies between 0 and 1,000 mV. I turns out that your MAF has gone bad. I found out sensor 1 is an air fuel ratio sensor not an 02 sensor. Open or short in mass air flow meter circuit with engine speed 4,000 rpm or more. At operating temperature the oxygen sensor signal varies between 0 and 1,000 mV. Peak airflow this morning was 182-183g/s on most of the runs, suggesting around 228bhp. Low fuel pressure will have the same effect on the learn process as high alcohol content in the fuel. Also, remember that MAF is a reading of the amount of air entering the engine. The first item to get replaced is often the oxygen sensor, but most of the time this will not fix the problem. While there are no known codes that are directly related to P0127 - "Intake air temperature too high", several MAF related issues can contribute to the setting of P0127. The only other clue I have is that ambient temp reading was 9 and IAT (input air temp) was 20 when engine was off, which does suggest a sensor issue. Before replacing the sensor, however, the rest of the circuit should be checked for proper operation. A4 (B5 Platform) Discussion - MAF reading high? - I had my car throw a CEL and went into limp mode a few days ago. In MAF mode, the truck ran a little better but still rough, and in Speed Density it would still stall out. The predator has an ambient air temp reading as well as an intake air temp reading. but from reading in this forum and the HP Tuner forum, it seems I have that reversed. The air intake system from the air filter. Which I tested the same way by back probing and I get a high reading of around (11. The Mass AirFlow (MAF) sensor is usually located between the air filter housing and the throttle. P0103: Mass Air Flow (MAF) Sensor Circuit High Input. Rough idle. So I finally had a chance to dig into this issue, and come to the conclusion of it being the ECM. This is a discussion on a tuning guide i found based on hptuners within the Computer & Tuning forums, part of the LSx Technical Help Section category; PCM Tuning Process Flow 1. short term fuel mixture too weak MAF signal absent or faulty Coolant temperature sensor signal absent or faulty Ignition System RPM signal absent or faulty Battery voltage too low/high heated oxygen Sensor Signal absent or faulty long term fuel mixture too weak in part load stage Idle air control valve signal absent or faulty. Coincidentally I'm selling a VG33E MAF on ebay right now for cheap (though again your problem doesn't sound MAF. Jetta , 2009 2. This is not the most definitive list on the subject, but does cover the majority of symptoms I've seen on these types of Ford mass air flow sensors: MAF Codes that light up the check engine light (CEL) on your instrument cluster. Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P0172. P0103 MAF Signal High Input to PCM. It should be considered a high priority to fix, as the MAF sensor not reading properly can really make an impact on the performance of the vehicle. The maf says it's at like 2500 grams per second. and still has following fault codes P0237 -- ECM-125D -- Charge pressure sensor -- Signal too low P0101 Mass or Volume Air Flow Circuit Range/Performance Problem. The MAF sensor may need to be cleaned to achieve the proper reading. Replace air filter and cleaned maf. Bookmark this page and share with friends having car troubles. Car idles erratically and doesnt go pass. but from what i gather, you are telling me the new maf i had on my car, the readings were too high, but in reality the car ran perfect with good power and great fuel economy. The MAF and MAP sensor readings are low for my area sea level. Checked the resistence of the N75 vale and it was around 28. Temperature Circuit Low Input - Short in IAT sensor circuit - IAT sensor (built into MAF meter) - ECM. This is less common, but. In modern cars, the only way to test the mass air flow sensor is with a scan tool. Diagnostic Trouble Code (DTC) P0101 will set if the actual MAF sensor signal is not within a predetermined range of the calculated MAF value. I found out sensor 1 is an air fuel ratio sensor not an 02 sensor. Description. pin 8, pin 14 4 Air injection system faulty hot film mass air flow sensor with hot wire 10 Voltage at mass air sensor too high/low. Would this mean its actually reading 8-10 at idle? If this is the case, thats pretty high isnt it? When I'm crusing at 65 on the freeway, the MAf reading is in the mid 30's. Common Symptoms Of A BAD Ford MAF Sensor. In response to a high or low voltage, the ECM or PCM will adjust the air/fuel mixture. Intermittent signals may cause hesitation, stumble and surging. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined expected range of the calculated MAF value, and in this case it's determined that the air flow is too high. P0102 MAF Signal Low Input to PCM. This is less common, but. 8L V6 Buick, Chevrolet, Oldsmobile, Pontiac 3. Sensor (G42) P0113 - 002 - Signal too High - Intermittent The code does not clear with a new maf sensor etc etc. Also, remember that MAF is a reading of the amount of air entering the engine. The MAF I will fit tomorrow as its a 5 min job to replace and reset adaptations. A reading of 128 +/- 10 is considered normal readings. 6 16v z16xe engine fitted, the problem im having is it idles erratic now and then and sometimes cuts out, it started doing it about every 1000 mile then its got worse until it was about every 30 mile and i got fault code 0130 - low voltage on front lambda, i looked at the live data from the sensor and it was showing very low, i was lucky to have a new sensor so i fitted it. They can also be Secured Personal Loans Rates used to diagnose problems associated with dirty mass air flow sensor, poor mechanical fuel pump or filter etc. any common problems like this please let me know. Hi i have problem with my 3. 9 mv is one of the ground. 3 Common symptoms of a faulty MAF sensor 1. You sure can, (if it runs at all) , usually the ecu will run the engine on a factory pre-established fuel map; BUT,most cars,if the MAP(manif absol. The MAF and MAP sensor readings are low for my area sea level. I checked my readings and at 2800 RPM, I am reading 3-4 lbs/min. BAD gas mileage. The catalytic converter is designed to burn emissions so that the car exhaust is less harmful. BD2 Module Trouble Code Comprehensive List Gas and Diesel PC. 5L engine codes CBTA and CBUA see TSB 01-14-23 -or- TPI 2034012. Assuming that the yellow/ green wire is one of the ground, the reading would be too high. This is the description of a Code 45 as set on GM products It is an indication of a rich mixture as indicated by the oxygen sensor readings. The MAF sensor may need to be cleaned to achieve the proper reading. A difference of more than a few degrees indicates a problem. I can't check the wiring diagram now to be sure because I am at work. MAF sensor code p0102 low input comes up. I performed a KAM reset to return the alcohol content to zero, and I left the fuel pump jumpered to high-speed mode. The amplifier buffers the MAF output signal and has a resistor that is laser trimmed to provide an output range compatible with the computer's load tables. I see no "Tips" on the website for the o2 sensor Response too Slow. The fuel trim data is within the usually accepted range of 0 ±10%. This had been in high end of normal range, but never this high. You can get another MAF for a small amount of money, but the MAF you need is a Pierburg and the MAF you can get is a Bosch. In some vehicles, a mass air flow (MAF) sensor is used. Advance Auto Parts has 24 different Air Flow Meter/Mass Air for your vehicle, ready for shipping or in-store pick up. Fuel trims may also be negative at idle with a bad or dirty MAF. Open or short in mass air flow meter circuit with engine speed 4,000 rpm or more. when ur baffled at a MAF reading too high. The Mercedes Sprinter delivers excellent fuel mileage, performance, and road handling compared to almost any other van in its class. 265? I tried live data on a 2011 nissan versa and noticed it read 2. Engine Mass Air Flow sensor (MAF) troubleshooting (V12) Written by the backyard hack mechanic Sean750 Document history: # 5 March 2005 added comments from Richard Arlidge about testing procedure (Richard, sorry it took so long to publish). The Governor Pressure Sensor input was too high or too low for 3 consecutive park/neutral calibrations. For a full discussion of our MAF sensor test protocol and findings, see K&N Mass Air Flow Testing Results and Findings. And when you needed a Bosch, you could only get a Pierburg for a fair price. DTC stored. MAF sensor on most vehicles are self cleaning these days… What they do is supper heat the little temperature wires to burn off the muck. The ECM compares the actual MAF sensor voltage signal to a predicted MAF value. The Powertrain Control Module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. So I'm still getting those code P0401 - air mass too highcar is a 2004 330d m57n I cleaned the MAF and made sure that was ok, it's fine, and I replaced the EGR valve ( with a 2nd hand one of. The car engine runs rich when idling and lean when running. Is Your Sensor Still Not Working? If these steps have not helped you identify and isolate the problem, there may well be a problem with your sensor. My car is a Peugeot. The car is a stock 98 A4 2. Intermittent signals may cause hesitation, stumble and surging. Which I tested the same way by back probing and I get a high reading of around (11. The only other clue I have is that ambient temp reading was 9 and IAT (input air temp) was 20 when engine was off, which does suggest a sensor issue. In either case, the sensor may be at fault. Diagnosing a plugged converter is fairly easy, but diagnosing converter efficiency requires tapping into the OBD II system with a scan tool to check for codes and to. 40vdc during engine operation (CM,R) or during KOEO (O). yes i know what a maf does. Someone else thinks maybe the MAF is getting condensation The dealer thinks the MAF is OK. This diagnostic code must be attended to very quickly, because if it remains on for a long time, the 3-way Catalytic Converter (TWC) can get damaged. 4L car or mini-van. I've seen MAF sensor reading too LOW, but never too high. The MAF sensor works by outputting a frequency signal that is proportional to the airflow through the meter. MAF sensor code p0102 low input comes up. Negative values indicate that the engine is running too rich and oxygen sensor control is therefore making it more lean by reducing the amount of time that the injectors are open. I'll try again tonight. When the air is cold, the thermistor in the sensor has a high resistance, which falls as the air charge warms. It takes a reading of the barometric pressure to calculate incoming air density and uses this to control boost in turbo engines. Output Frequency (High): This table is used to calibrate the MAF sensor in the high frequency range. This document and the associated downloadable files are meant as an aid to assist you in diagnosing how your Air/Fuel (AF) mixture delivery is performing, and how to use Autotap and a MAF Translator to adjust various parameters. I would be looking at a sticking EGR valve on this, you can connect a mitty vac to the EGR and check the valves operation. In these cases you are best off treating the MAF sensor alone. The ECM needs to know intake air volume to calculate engine load. Jetta , 2009 2. com FREE DELIVERY possible on eligible purchases. This comparison will determine if the signal is stuck, or is too low or too high for a given operating condition. 265? I tried live data on a 2011 nissan versa and noticed it read 2. 6 volts during KOER indicates a hard fault. The Mass Air Flow (MAF) sensor measures the amount of air ingested by the engine. The fuel trim data is within the usually accepted range of 0 ±10%. At closed throttle the solenoid is momentarily activated. Every reading from the MAF to the ECM was what it's supposed to be. The computer may be using the MAP sensor to measure only the positive air pressure coming from a turbocharger or supercharger. Which I tested the same way by back probing and I get a high reading of around (11. Although there are different configurations of MAF sensors, most current hot-wire MAFs share the same basic operating principles. Output Frequency (High): This table is used to calibrate the MAF sensor in the high frequency range. This means that the voltage input to the ECU is too high and. Plus where the MAP sensor is located, you should absolutely expect oil vapors in the air and will be on the sensor, this doesn't effect its operation or they wouldn't use it. This is what I have done to try to diagnose this problem: Cleaned TBI Replaced MAF, twice. As a result of late intake valve opening, the vacuum will be low, causing the MAP sensor to see a load adding more fuel, causing high CO. I set the reading at the lower volt and the max reading at the highest volt. Also I havent changed my aif filter in such a while it is kind of dirty. Here is a video on how a Mass Air Flow and a Manifold Absolute Pressure Sensor work and also how you can test them using a basic multimeter. Mass Air Flow Sensor (MAF) FAQ: Read as you know less than you think you do! General Community compare the readings from the two sensors. If a vehicle has a modified inlet system and erratic MAF sensor output, it is often helpful to install some sort of flow straightening. If the MAF sensor appears to be reading normally, check the engine coolant sensor to make sure it is reading within range. As you have replaced the sensor, it points to a fault in the wiring harness, or less likely, in the ecm. I let the car cool overnight with the hood open and then compared IAT, ambient temp. Denso 197-6020 Mass Air Flow Sensor. 63 g/s at idle. However the MAF reading was off using this same test. If the numbers are low at idle, but climb up in to the +20 range on a part throttle cruise, the mass air flow sensor may be faulty. relacion de codigos ECM, diagnostico mecanica automotriz. When the air is cold, the thermistor in the sensor has a high resistance, which falls as the air charge warms. Higher than normal MAF can also be caused by ruptured hoses in the the turbocompressor's discharge side or by too high a turbo pressure for instance. Oxygen messfühler analyzers could also be used to distinguish if the air- fuel mix in rich or even lean; Spend a great vacation in this particular spectacular destination and cherish the. /Hg shows very high engine vacuum, which jibes with the reported TPS PID. 5 V) Key Power to PCM pin 5. LONGFT1 values that differ greatly from LONGFT2 values would rule out concerns that are common for both banks (for example, fuel pressure concerns, MAF sensor, etc. Bookmark this page and share with friends having car troubles. Still having the problem of it not wanting to start up the second time I try to crank it, have to keep giving it gas and eventually it will run and idle in MAF mode. Buy MOSTPLUS Mass Air Flow Sensor Meter MAF for Mercedes 0280217515: Air Flow Meters - Amazon. Record your MAF sensor reading at idle, and again at various RPM ranges. And im far from being an expert. Water contamination can cause a lean condition. The voltage of the oxygen sensor helps your powertrain control module (PCM) or engine control module (ECM) to track the air-to-fuel ratio. The other wire is the wire that sends the map sensor voltage to the module and this reading will vary with operating conditions. When "false" or un-metered air enters the intake system downstream of the MAF sensor, the MAF sensor will underestimate intake air and drive the fuel system too lean at idle or low engine speeds. I can go 50mph without touching the gas peddle. With the Dodge Caravan, P0101 means the the Mass Air Flow (MAF) sensor has a Range/Performance problem. I'm not proud of it, but in 70K miles, I had never cleaned it. Started to idle high at 2000 to 3000. I found out sensor 1 is an air fuel ratio sensor not an 02 sensor. Some manufacturers incorporate the Intake Air Temperature (IAT) sensor as part of the Mass Air Flow (MAF) sensor (Air Flow Meter). Mass Air Flow Sensor (G70): Signal too Low - would you recommend replcaing my MAF? Checked readings from MAF once all faults got cleared and it showed 364. The MAF sensor hot wires are very sensitive, and MAF sensor cleaner cleans and dries very quickly. i have taken it to the dealer 3 times for the same code, P0101. 1,100 RPM - which is way too high. A small quantity of air entering the engine indicates a deceleration or idle. 9, sensor 2 voltages steady around 0. MAF sensor on most vehicles are self cleaning these days… What they do is supper heat the little temperature wires to burn off the muck. While there are no known codes that are directly related to P0127 - "Intake air temperature too high", several MAF related issues can contribute to the setting of P0127. that can cause weird MAF readings too. Is Your Sensor Still Not Working? If these steps have not helped you identify and isolate the problem, there may well be a problem with your sensor. I'll also change the fuel filter to see if it helps. So I finally had a chance to dig into this issue, and come to the conclusion of it being the ECM. The first thing to check is the intake vacuum with a vacuum gauge. I've seen MAF sensor reading too LOW, but never too high. 8L (3800) vehicle without a scan tool. In other words, too much gas is left in the exhaust after combustion. Should be more like 12-13 from your figures. 0 range (18% less than normal). Plus where the MAP sensor is located, you should absolutely expect oil vapors in the air and will be on the sensor, this doesn't effect its operation or they wouldn't use it. Basically this P00BD diagnostic trouble code (DTC) means that there is a problem with the Mass or Volume Air Flow (MAF) "A" sensor circuit. What to do: Put in clean air filter. Could it also cause the check engine light to come on because not enough air is going to the MAF sensor. M P0127 Intake Air Temperature Too High (Bank 2 Sensor 3) P0168 Fuel Temperature Too High. At idle, my MAf reading is 4, sometimes 5. Cadillac Forum for Discussion, Information, How-To, Fun. I spent a week with a good thermometer and feel confident the Impreza temps are too high. Temperature Circuit Low Input - Short in IAT sensor circuit - IAT sensor (built into MAF meter) - ECM. 23 volts (Refer to equivalent grams/second chart in Pinpoint Test DC) in continuous memory or key ON and engine running indicates a hard fault. LONGFT1 values that differ greatly from LONGFT2 values would rule out concerns that are common for both banks (for example, fuel pressure concerns, MAF sensor, etc. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: