P1139
Long Term Fuel Trim Add. Fuel B2 System Too Rich
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Increased fuel consumption
- Black smoke from the exhaust pipe
- Unstable engine operation
- Power Loss
- Gasoline smell from exhaust
Causes
- Oxygen sensor malfunction (Bank 2)
- Fuel leak in the fuel system
- Dirty or faulty injectors
- Problems with the EVAP system
- Malfunction of the mass air flow sensor (MAF)
How to Fix
- Check oxygen sensor readings
- Inspect the fuel system for leaks
- Check the condition and operation of the fuel injectors
- Diagnose the EVAP system for faults
- Check the performance of the mass air flow sensor