Can a NOx sensor cause an AdBlue warning?
Yes. The ECU uses NOx sensor readings to decide whether the SCR system is working. A sensor that fails or drifts can make a healthy system look faulty, and the ECU responds with an AdBlue or emissions warning.
Why we test before replacing
NOx sensors are expensive, and a NOx sensor code does not always mean the sensor is at fault. Wiring faults, exhaust leaks, dosing problems or poor fluid can all produce similar readings. We compare live data from both sensors and check the circuits before recommending a replacement.
- Upstream and downstream sensor live data comparison
- Sensor heater and communication circuit checks
- Exhaust leak inspection near sensor positions
- Confirmation of correct AdBlue dosing
Booking
Most customers drive in to our workshop at Padley Farm, Drove Lane, Sleaford (NG34 8JQ). A mobile service is available within roughly 20 miles of Sleaford for an extra charge, and a non-refundable deposit is required for all mobile call-outs.