P2232
O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 2)
The O2 sensor signal wire on bank 1 sensor 2 has shorted to the heater wire. This pulls the signal away from a measurement of exhaust composition and produces erratic fuel-trim behaviour.
- 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.
- Short between signal and heater wiresCommon
Parts involved
- Oxygen Sensor
P2232 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.