Severity: Fix within days. Drive with caution and watch for new symptoms.
On Ford vehicles, this is the bank 2 version of P1131: the upstream oxygen sensor is not switching and the engine is running lean on bank 2.
Check for vacuum leaks, clean the MAF sensor, and test the bank 2 oxygen sensor and fuel pressure.
Same as P1131, on the other bank. Get it checked soon.
You can drive short distances carefully; watch for worsening symptoms. Same as P1131, on the other bank. Get it checked soon.
The most common causes are: Vacuum leak; Dirty mass air flow sensor; Failing oxygen sensor on bank 2; Low fuel pressure; Exhaust leak. A scan tool and a visual check of the parts above is where a technician starts.
Check for vacuum leaks, clean the MAF sensor, and test the bank 2 oxygen sensor and fuel pressure.
