Volkswagen Audi Error Code P1139: How to Fix It

Q: Can I drive with error code P1139?

It's not recommended. Driving with a rich condition can damage the catalytic converter and reduce fuel economy. Have it diagnosed soon.

Q: Will a bad MAF sensor always cause P1139?

Not always, but it's a common cause. Other possibilities include vacuum leaks, bad oxygen sensors, or fuel pressure issues.

Q: Do I need to clear the code after repair?

Yes, after fixing the underlying issue, use an OBD2 scanner to clear the code. The check engine light should turn off.

Q: How much does it cost to fix P1139?

Cost varies from $50 for a MAF sensor cleaning to $300+ for sensor or injector replacement. Diagnosis may be $100-150.

Q: Is P1139 specific to VW/Audi?

Yes, P1139 is a manufacturer-specific code for Volkswagen Group vehicles, indicating a problem on bank 2.

Abstract

Error code P1139 on Volkswagen or Audi vehicles indicates that the engine's long-term fuel trim is detecting a rich condition on bank 2. This means the air-fuel mixture has too much fuel relative to air, often caused by a faulty mass air flow (MAF) sensor, vacuum leak, or fuel system issue.