Random Misfire, Rough Idle, and CEL
 

Hello.

I own a 2009 Audi A4 with around 150,000 miles on it. Over the last few weeks I have experienced: A rough idle, a hesitation while accelerating, random misfires and a permanent check engine light. I have fixed & replaced the: Coils, Spark Plugs, Air Filter, and PCV Valve. I will note the error code from the scan always points to the PCV Valve, but I just replaced it with a new one from Audi.

What else could it be? I have read that it is possible it could be a timing belt or maybe the MAF (Mass Air Flow Sensor).

Any help would be appreciated. Thanks

Hello I’m Stephen,I have the same problem rough idle,I also changed the pvc valve ,it turned out the low oil pressure light but still rough idle like it wants to shut off