Powertrain, generic · Computer and auxiliary outputs

P06EA NOx Sensor Processor Performance Bank 1 Sensor 1

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Faulty electronics in the NOx sensor control unit
Moisture or corrosion in control unit or connector (underbody location)
Under- or overvoltage or dips in the sensor supply
Unsuitable replacement sensor or software

Symptoms

  • 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

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€250–900
Time0.5–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

nox sensornox sensor control unitengine control module

Related codes

P06EBP2200P2201P220AU029DP22FB

References: law.cornell.edu, fordservicecontent.com, patents.google.com.