The end result are symptoms caused by a leaner air/fuel mixture.īefore replacing the MAF sensor, you should check it to see if it's dirty and if it is, clean it before replacing it (since this may solve the problem). This results in the PCM ‘seeing’ less air entering the engine and thus less than the ideal amount of fuel being injected. When the MAF sensor gets contaminated with dirt (and other stuff like oil), the MAF sensor still produces a signal but since the dirt interferes with the precise measurement ability of the MAF sensor, the PCM gets an incorrect measurement. The MAF sensor's job is to measure the amount of air entering the engine so that the PCM can know how much fuel to inject into each engine cylinder. Lack of power when accelerating the vehicle.Won't pass state mandated annual emission test.DTC P0171 (Lean Air Fuel Mixture), if your specific vehicle is OBD II equipped.
#2004 impala mass air flow sensor problems code#
What really sucks is that the PCM (Powertrain Control Module = Fuel Injection Computer) will not set a 'The MAF Sensor is Dirty' Trouble Code (and one doesn't exist).īut when it does get dirty you'll experience one of the following symptoms: In some cases, a dirty MAF sensor doesn't really cause a lot of havoc with the way your engine runs. The most common symptom, when the MAF sensor gets dirty (contaminated) is that the engine bogs down when you accelerate the car (or mini-van) but it will idle fine. If the MAF sensor, on your specific GM vehicle, is not covered by this one, the following tutorial may apply: You can find this tutorial in Spanish here: Cómo Limpiar El Sensor De Flujo De Aire (MAF) (GM 3.3L, 3.8L) (at: ).
No Improvement In Performance After MAF Clean.
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