P2233: O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 3)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P2233 mean?
The O2 sensor signal wire on bank 1 sensor 3 has shorted to the heater wire. This pulls the signal away from a measurement of exhaust composition and produces erratic fuel-trim behaviour.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Short between signal and heater wires
Likelihood is a general estimate across vehicles; your make and model may differ.
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