P2223NOx Sensor Heater Sense Circuit Low (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2223 indicates that the heater sense line of the bank 2 NOx sensor sits at or near ground potential, so the electronics reads an impossibly low value for heater resistance. A sense conductor rubbed through to the exhaust bracket or a shorted measuring input inside the sensor module are the usual explanations. No manufacturer publishes the bank 2 code. For bank 1, GM's 3.0L LZ0 tables carry the equivalent P2210 as a grounded HTemp pin, judged on 80 failed of 160 samples with the powertrain relay above 11 V, Type B, so the MIL waits for a second trip. With no usable feedback the sensor cannot hold its working temperature. P2224 is the opposite polarity, P2219 a low fault on the control side.
- What you may notice
- Malfunction indicator lamp on after two trips
- No valid NOx value from bank 2
- Likely causes
- LikelySense lead of the bank 2 sensor shorted to ground
- PossibleShorted measuring input in the sensor module
- RareWater ingress in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.