What It Is
A genuine Bosch mass air flow sensor (Bosch part 0281002757) for the Mk4 ALH TDI engine.
Why This Matters
The MAF sensor tells the ECU how much air is entering the engine, which the ECU uses to calculate the correct fuel delivery. A failing MAF sensor commonly shows up as reduced fuel economy, a noticeable loss of power, or the car dropping into limp mode, where power is cut until the car is restarted.
Fitment
1999-2003 Mk4 Golf and Jetta TDI, and 1998-2003 Mk4 New Beetle TDI, all with the ALH engine code.
Common Questions
How do I know if my MAF sensor is failing?
Common symptoms include lower fuel economy, a loss of power, or the car going into limp mode, where it loses power until you restart it.
Is this a genuine Bosch part or aftermarket?
Genuine Bosch, part number 0281002757.
Does this fit the BEW engine?
No, this sensor is specific to the ALH engine. BEW-engine cars use a different MAF sensor.
