P2233O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 3)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2233 is the heater-to-signal short for sensor 3 on bank 1, a third oxygen sensor that some engines fit after a second catalyst or between two catalyst bricks. No manufacturer documents this code publicly. GM's checks for the rear-sensor codes P2232/P2235 show how such a fault is normally caught: the signal leaps by more than 2 V within 0.04 s whenever the heater is switched off. Jaguar Land Rover's 2015 bulletin for the 3.0 supercharged V6, which carries three sensors per bank, lists many sensor 3 faults but none of this type. CARB requires circuit faults of every monitored oxygen sensor to be detected. P2236 is the bank 2 counterpart. A third sensor serves only monitoring, so the car drives normally with the warning lamp on.
- What you may notice
- Check engine light without noticeable driving change
- Emissions inspection failed because of the stored code
- Likely causes
- LikelyInternal leakage between heater and sensing element of sensor 3
- PossibleSensor 3 wiring melted or chafed along the exhaust or underbody
- RareCorroded underbody connector of the third sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €280
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.