P2208NOx Sensor Heater Sense Circuit (Bank 1 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Besides the control line, the NOx sensor heater has a sense or feedback path through which the controller checks how the heater actually responds (current, resistance or element temperature). P2208 marks a general fault in this sense circuit of the upstream sensor on bank 1. GM calls it NOx Sensor Heater Feedback Circuit (3.0L LZ0 diesel); Volvo and Mack class P2208 on the inlet sensor as a sensor failure that requires replacement. CARB demands heater performance monitoring within the supplier's limits. P2209 is the plausibility check of the same feedback, P2210/P2211 low or high values, P2212 dropouts; P2205-P2207 concern the control side. MIL on, driveability normal.
- What you may notice
- Malfunction indicator lamp on
- NOx sensor reports no valid value
- Likely causes
- LikelyInternal fault in the NOx sensor or its control unit
- PossibleDamaged wiring between sensor element and sensor control unit
- 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: €250 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.