P2234O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2234 means the heater of the front air-fuel sensor on bank 2 couples into its measuring circuit. On a wide-band sensor the disturbance is small, so the check is finer than on rear sensors. GM's 2005 tables for the Bosch-equipped 2.8/3.6 V6 look for a signal step of 0.08-0.2 V appearing no later than 0.05 s after each heater switching edge; 18 such steps in a 10 s window count as a failure, the sensor must have been fully hot for 10 s, and the MIL follows after two trips. Jaguar Land Rover lists P2234 among the bank 2 front-sensor codes of the 2014-2016 LR4, Range Rover and Range Rover Sport 3.0 V6 and blames thermal shock from water hitting the hot element; the sensor is replaced. P2231 is the same fault on bank 1. Closed-loop fuelling on bank 2 may drop out.
- What you may notice
- Check engine light
- Higher fuel consumption when bank 2 runs without lambda control
- Other bank 2 front-sensor codes stored at the same time
- Likely causes
- LikelyFront sensor element cracked by thermal shock (water on the hot sensor)
- PossibleHeater and signal wires of the bank 2 sensor touching in the harness
- RareMoisture in the sensor connector bridging heater and signal pins
- 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: €90 – €380
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.