The 03/2003 and later E46 use the 6 pin MAF connector. The MS45 ECM gets the Intake Air temperature from the MAF, the earlier MS42-43 ECM uses a temp sensor in the intake manifold. The M56 325 engine uses the same size MAF as the 330 models. Join the BMW Car Club of America. Oil contamination in MAF connector or O2 sensor connectors. Also check ignition coils, cam and crank sensors, and oil sensor for leakage contributing to oil intrusion in wiring harness. Defective MAF (Mass Air Flow) sensor (especially on Mercedez-Benz and other European autos. There are a lot of problems with aftermarket MAF sensors.) The mass air flow sensor (MAF) measures the airflow entering the engine and is a vital component in a modern fuel injection system. Having a malfunctioning or dirty mass air flow sensor (or a dirty air filter) can result in an improper air-to-fuel ratio being fed to the engine’s combustion chamber and may even cause a misfire if the MAF
The most common signs of bad mass air flow sensor (MAF) in VW Passat are loss of power or slow acceleration, engine hesitation or jerking during acceleration, erratic idling, misfires, poor exhaust emission values and sometimes black smoke comes out of the tailpipe. The mass air flow sensor is part of the engine’s intake system and is located
The most common signs of bad mass air flow sensor (MAF) in Buick Park Avenue are loss of power or slow acceleration, engine hesitation or jerking during acceleration, erratic idling, misfires, poor exhaust emission values and sometimes black smoke comes out of the tailpipe. The mass air flow sensor is part of the engine’s intake system and is
The mass airflow sensor (commonly abbreviated to MAF) is one of the most important engine management sensors. A bad mass airflow sensor can leave your Ford Explorer's engine running rough, or even inoperable. A MAF sensor measures the density of the air entering the intake manifold. It passes this information onto your Explorer's ECU.
Since the MAF sensor is responsible for measuring air flow into the engine, they have a lot of air passing through them. In fact, more than 9000 liters of air can flow through the engine for every liter of fuel used. That’s a lot of air! And with that comes the potential for a lot of contamination. Dust, dirt and other debris can all get into
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    • e46 mass air flow sensor symptoms