P06EANOx Sensor Processor Performance Bank 1 Sensor 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- A modern NOx sensor is a smart sensor: a ceramic sensing element with pump cells and heater plus its own control unit with a microcontroller, which regulates the pump currents, calculates NOx and oxygen and sends them to the engine module over CAN. P06EA means this control unit of sensor 1 (before the SCR catalyst) reports an internal fault – its self-tests of RAM and ROM or EEPROM checksums fail – so the electronics, not the sensing element, are at fault. No manufacturer document available to us uses this code: Ford's 2023 diesels run exactly these checks continuously, with a fault after 5 s, but report them as P2200; GM uses the P2200 family and U029D/U029E. The NOx value is then invalid, so SCR dosing runs on a model or stops, a warning appears and, depending on market, a countdown to a start lock.
- What you may notice
- Check engine light or emissions warning
- Message to check AdBlue/emission system, possibly countdown to start lock
- Follow-up codes for SCR efficiency or NOx plausibility
- Driveability usually unchanged
- Likely causes
- LikelyFaulty electronics in the NOx sensor control unit
- PossibleMoisture or corrosion in control unit or connector (underbody location)
- PossibleUnder- or overvoltage or dips in the sensor supply
- RareUnsuitable replacement sensor or software
- 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.