![]() Cleaning the sensor might hold off problems for a while, but the MAF sensor should be replaced. Sometimes the Air Flow Sensor and the sensing wire get covered with dirt, dust, or oil residue, which can set a P0171 in addition to the P0102 code. It does this because the Barometric Pressure Sensor is actually part of the Mass Air Flow Sensor. (These conversion tables will help.) When the Mass Air Flow Sensor sees this Barometric reading, it adjusts its Air Density table and then “under reports” the actual amount of air entering the engine. Say the reading is 26.5 Hg and you are close to sea level, you know that you have a defective Air Flow Meter because it is telling you that you are at about 4500 feet above sea level. Start the engine, let it idle, and then check the Barometric Pressure reading on the scan tool data. There is a very effective “truth test” for any Mass Air Flow Sensor. If the grams per second varies a lot or moves in opposite directions to RPM and throttle position, then you may have verified the P0102 code setting condition. Compare these values to the Mass Air Flow grams per second PID. Pay close attention to the engine load, throttle position, RPM, and road speed. When diagnosing a P0102 code, it is important to record the freeze frame information and then to duplicate the code setting conditions with a test drive. P0102 Diagnostic Theory for Shops and Technicians NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog.CO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas.HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog.
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