What does code P2233 mean?

DTC codes / P22xx · Fuel and air metering (injector circuits) / P2233

P2233O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 3)

P2233 means the engine control module has detected an abnormal electrical path between the signal circuit and the heater circuit of the downstream oxygen sensor on bank 1, sensor 3. The sensor's signal wire is shorted to its heater wire, so the computer cannot trust the oxygen reading from that sensor.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.