Severity: Fix within days. Drive with caution and watch for new symptoms.
The first oxygen sensor on bank 1 is stuck at a high voltage, which the computer reads as a rich mixture even when the mixture may be fine.
Check fuel pressure and injectors for leaks, then replace the sensor if it stays stuck high.
The engine may run rich, use more fuel, and foul spark plugs. Drivable with care.
You can drive short distances carefully; watch for worsening symptoms. The engine may run rich, use more fuel, and foul spark plugs. Drivable with care.
The most common causes are: Failed oxygen sensor; High fuel pressure; Leaking fuel injector; Wiring short to power; Contaminated sensor. A scan tool and a visual check of the parts above is where a technician starts.
Check fuel pressure and injectors for leaks, then replace the sensor if it stays stuck high.
