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RPM Up & Down

4265 Views 6 Replies 4 Participants Last post by  tumalc
I put my car on Park and the RPM started going up and down on its on and I could also hear my engine noise. It was strange. BTW It 2008 B6 2.0T @ 54K.

After few hours, I turned on my car again and I got Engine Check light. I took it to Close by AutoZone and they gave me two codes P0171 and P0507. They said its oxygen sensor or mass Air Flow Sensor.
Tomorrow morning, I am going to take it to the Dealership so they can check it out. But before I do that and before they take away all my money on service, is there something I can do to fix the issues by myself.
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16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean

Possible Causes
Mass Air Flow Sensor (G70) defective

Possible Solutions
Check Mass Air Flow Sensor (G70)
Check Fuel Pressure Regulation
Check Fuel Pump
Check Injectors
Check Intake System for Leaks
Check Exhaust System for Leaks
Check Secondary Air System for Leaks
Check Vacuum Pipes for Leaks

Retrieved from ""
Category: Fault Codes

16891/P0507/001287 - Idle Control System RPM: Higher than Expected.

Possible Symptoms
Malfunction Indicator Lamp (MIL) active

Possible Causes
Throttle Valve Control Module (J338) dirty/faulty
Wiring/Connector(s) from/to Throttle Valve Control Module (J338)

Possible Solutions
Check Throttle Valve Control Module (J338)
Check Wiring/Connector(s) from/to Throttle Valve Control Module (J338)

Retrieved from ""
Category: Fault Codes
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Sounds like it could be a leak in the intake tract, PCV failure, or bad MAF sensor. Hopefully, it's not the valves completely covered with carbon and not seating correctly, but it is a possibility given the mileage. How do you drive the car?
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