P22B5
O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 2)
The pumping current trim line on bank 1 sensor 2 is open. The trim is the per-sensor calibration code that adjusts pumping current to compensate for production tolerances.
- 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.
- Open trim lineCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Oxygen Sensor
P22B5 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.