![]() In some rare cases a bad sensor may show higher readings. A contaminated or bad air flow sensor will, in most cases, show lower air flow readings than a known good one. Often mass air flow sensor readings are measured at idle, 1,000 RPM, 2,000 RPM and 3,000 RPM. Mass Airflow Sensor (MAF) readings of a 2.4L 4-cylinder engine at different RPMs. They compare the readings to the specifications or to the readings of a known-good mass airflow sensor. Mechanics measure the amount of air flow (mass air flow sensor readings) at different RPMs. In modern cars, the only way to test the mass air flow sensor is with a scan tool. Trouble codes P0171 System Too Lean (Bank 1) and P0174 System Too Lean (Bank 2) are also often caused by a bad or contaminated mass air flow sensor. P0104 - "Mass Air Flow Circuit Intermittent" P0101 - Mass Air Flow Circuit Range/Performance P0100 - Mass Air Flow Circuit Malfunction The following trouble codes are usually associated with a mass air flow sensor: This trouble code can be retrieved with a scan tool. When the air flow sensor signal varies from the expected range, the PCM records a fault and stores the corresponding trouble code, illuminating the Check Engine light on the dash. In addition, a faulty mass air flow sensor might cause the Check Engine or Service Engine Soon light to come on.Ī problem with the air flow sensor could also alter the shifting pattern of the automatic transmission. As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.The long and short fuel trim readings also need to be checked. Read more: How the mass air flow sensor is tested. The air flow sensor readings must be checked with the scan tool at different RPMs and compared to the readings of the known good sensor or to the readings from another car of the same model. For this reason, the mass air flow sensor reference voltage and ground must be checked at the sensor connector. Google 'Make Model P0102 service bulletin' if you don't have access to factory service bulletins.Ī bad ground or even a blown fuse for the MAF sensor can also cause the code P0102. For example, the GM service bulletin 18-NA-217 describes a problem with some 2017-2019 Silverado/Sierra trucks where a short in the wiring at the fuel composition sensor (Flexible Fuel Sensor) could cause the code P0102 along with other codes. However, the element is very delicate and should be cleaned carefully to avoid damage.Ĭheck related service bulletins. If the sensor element is dirty, cleaning it may help. Replacing the mass air flow sensor often resolves the issue.Ī Nissan technical service bulletin (TSB) for the trouble code P0102 in 2002 Nissan Maxima recommends removing debris from inside the air filter housing, replacing the airflow meter assembly and reprogramming the ECM.Ī Toyota TSB describes a problem with the 2006 Toyota Tacoma, where loose terminals in the MAF sensor connector could cause the code P0102 the connector must be checked and repaired if needed.ĭebris blocking the airflow sensor element. In some Mazda vehicles with the Skyactiv engine, the code P0102 could be caused by a failed mass air flow sensor. The repair involves clearing the code and replacing the MAF sensor if no other problems are found. In many GM vehicles, the code P0102 is caused by a faulty mass air flow sensor. faulty manifold absolute pressure sensor (MAP). electrical problem with the MAF sensor wiring or connector. restricted air screen before the air filter restricted or collapsed intake air snorkel (boot) debris blocking the air flow sensor element faulty or contaminated mass airflow sensor ![]()
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