P2209NOx Sensor Heater Sense Circuit Range/Performance (Bank 1 Sensor 1)
- 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
- P2209 is the performance check of the NOx sensor heater: the feedback is electrically present but shows that the element does not reach or hold operating temperature as expected. VW's 2014 TDI specification books (Passat, Touareg) set it when NOx control has not become active more than 180 s after the dew point was passed. Ford's 2023 diesel OBD summary uses P2209 as NOx signal readiness, judged by the ratio of actual to expected sensor on-time. GM names it Heater Feedback Performance. CARB requires both heater performance and NOx sensor activity monitoring. P2208 is the circuit fault, P2210/P2211 low or high values. MIL after confirmation, no limp mode.
- What you may notice
- Malfunction indicator lamp on
- NOx sensor not ready for long periods after start
- Possible follow-up SCR efficiency faults
- Likely causes
- LikelyAged NOx sensor element that heats up too slowly
- PossibleLow supply voltage or poor ground to the sensor
- RareProlonged cold or wet exhaust delaying dew-point release
- 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.