P1139 Possible Causes
- Faulty O2 sensor
- High fuel pressure
- Faulty mass air flow (MAF) sensor
- O2 sensor harness is open or shorted
- Poor electrical connection in O2 sensor circuit
How to Fix Code P1139?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check engine light on (or service engine soon warning light)
P1139 Meaning
Fuel System Too Rich Bank 2 is the generic description for code P1139, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about OBDII code P1139.