BMW E87 NOx sensor faults
116i118i
E87 what symptoms does a faulty NOx sensor cause?
The idle can be uneven or shaky and consumption slightly increased. The warning light may come on and go off by itself. The sensor tip can become sooty, in which case the engine management receives a wrong signal and a fault code is stored.
E87 how is a faulty NOx sensor repaired?
If the fault code points to the sensor's electronics, the whole NOx sensor is replaced. On the 116i with the N43 engine the part number is 11787587130. Always check the part against the car's VIN before buying. A single random fault code does not yet require action.
E87 car stalls, fault codes for NOx sensor and low fuel pressure – which is the cause?
Stalling can be caused by the sensor on the low-pressure side of the fuel system, because the transfer pump is then not controlled correctly. A NOx sensor fault is unlikely to directly prevent starting or idling, so check both.
Related articles
BMW E87 battery drains or won't chargeBMW E87 diesel lacks powerBMW E87 DSC and traction control light on or flashingBMW E87 cooling system faults: water pump, thermostat and temperature sensorBMW E87 timing chain tensioner and timing drive faultsBMW E87 braking vibration and noisesBMW E87 propshaft support bearing and rear-end vibrationBMW E87 clutch and gearbox noises and faults