P2225NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2225 covers a heater sense circuit on the bank 2 NOx sensor that fails only for moments: the feedback drops out or jumps, then returns to normal, which a steady open or short code would not describe. No manufacturer documents thresholds for P2225 or for its bank 1 twin P2212. GM's 3.0L LZ0 tables handle only the persistent faults on the HTemp pin (P2208, P2210, P2211) and mention that the Continental sensors debounce electrical errors for 1.5 s internally, so very short glitches may never reach the engine computer. Smart sensors flag heater faults over CAN. Look for a cracked conductor that opens when hot, a loose terminal or moisture. The warning lamp may switch on and off between drives.
- What you may notice
- Malfunction indicator lamp that comes and goes
- Bank 2 NOx value briefly invalid
- Likely causes
- LikelyLoose or corroded contact in the bank 2 sensor connector
- PossibleCracked sense conductor that opens with heat or vibration
- RareSporadic fault in the heater measurement of the sensor module
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.