P223C
O2 Sensor Pumping Current Range/Performance (Bank 1)
The pumping current of the wide-band O2 sensor on bank 1 is in electrical range but plausibility check fails. Wide-band sensors use a pumping cell that adjusts oxygen concentration in a reference chamber; the current required is proportional to lambda.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Pumping cell agedCommon
- Sensor element aged beyond calibration windowLess likely
- Sensor mounting loose - signal dampingLess likely
Parts involved
- Oxygen Sensor
P223C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.