alternative NOx Sensor / emulator

NOXEM 402 replaces the following NOx sensors | Cilck to open



Bottom of car, passenger side, access form the car’s bottom

Developed for

BMW | F10/11 with N53B30 series petrol engine

Symptoms of revelant problem
  • Rough idle (cold and/or hot engine)
  • Uneven run at mid/high loads
  • Misfires and error messages about misfires
  • Error messages about cylinder’s and/or bank’s fuel trim
  • Problems with cold engine start
  • Increased fuel consumption
Special features of NOXEM 402
  • Restores normal operation of NOx system and fuel economy
  • DOES NOT require NOx catalytic converter replacement
  • Restores creation of cylinders individual and bank fuel adaptations for idle, mid/high loads, cold engine – smooth operation at all conditions
  • Restores Stratified charge and Homogeneous lean fuel injection modes, regeneration, and desulfation of NOx catalytic converter
  • Increased lifetime: average more than 300’000 km

Installation of NOXEM 402

Installation of NOXEM 402


Reason for replacement

Following NOx sensor error messages

12C104 NOx sensor, binary oxygen sensor: Line disconnection

12C108 NOx sensor, binary oxygen sensor: Short circuit

12C204 NOx sensor, linear oxygen sensor: Line disconnection

12C208 NOx sensor, linear oxygen sensor: Short circuit

12C304 NOx sensor, heating: Activation, line disconnection

12C308 NOx sensor, heating, activation: short circuit

12C401 NOx sensor, Plausibility, signal activity too low

12C501 NOx sensor, sensor poisoning: binary lambda signal too lean

12C502 NOx sensor, sensor poisoning: binary lambda signal too rich

12C504 NOx sensor, sensor poisoning: NOx signal too low

12C601 NOx sensor, operating readiness: Signal not available at start

12C602 NOx sensor, operational readiness: signal not available during operation

12C701 NOx sensor, heating: Heat output too low during starting

12C702 NOx sensor, heating: Heat output too low during operation

12C704 NOx sensor, heating: Supply voltage

12C801 NOx sensor, oxygen sensor before catalytic converter, plausibility: correlation fault

12C901 NOx sensor, adjustment: fault at start of charging phase

12CA01 NOx sensor, trailing-throttle check: binary lambda signal too rich

12CA02 NOx sensor, trailing-throttle check: linear lambda signal too rich

12CA04 NOx sensor, overrun test: NOx signal too low

12CA08 NOx sensor, overrun test: NOx signal too high

12CB01 NOx sensor, regeneration, nitrogen-oxide cat.: regeneration monitoring

12CB02 NOx sensor, regeneration, nitrogen-oxide cat.: time-controlled regeneration abort

12CC01 NOx sensor, oxygen sensor signal after regeneration, dynamics: Binary dynamic response too low

12CD01 NOx sensor, self-diagnosis: limit value 1 exceeded

12CD02 NOx sensor, self-diagnosis: limit value 2 exceeded

12CE01 NOx sensor, version: incorrect

CD8510 Lost Communication With NOx Sensor ‘A’

Following NOx catalytic converter error messages

180401 NOx catalytic converter: Efficiency below limit

Following live data

Stratified charge: disabled

The engine performs Homogeneous injection mode only

NOXEM series NOx emulator is built using the highest quality components

  • Bosch’s latest-generation sensor is controlled and measured by ourselves developed analog control module which provides the highest accuracy of exhaust Lambda value. Now you can use NOx emulator Lambda data as reference
  • Up to 30V overvoltage and wrong supply polarity protection guarantees the highest resistance to car’s onboard voltage spikes
  • High precision reference frequency oscillator and industrial temperature grade components provide uninterruptible operation in a wide temperature range
  • High power oversized sensor control stage reduce heating and facilitate the operation of the electronics module at high temperatures
  • Double sealed construction with 5mm stainless steel base plate is a guaranty for long and safe operation in hard environment conditions

Electrical characteristics

  • Power supply: +9.0 .. +16.0V DC
  • Long-term over-voltage (1 hour): +24.0V DC
  • Short-term over-voltage (1 second): +30.0V DC
  • Wrong polarity short-term over-voltage (1 second): -30.0V DC
  • Maximal current consumption (+14.0V DC; +25oC): 2.5A
  • Average current consumption (+14.0V DC; +25oC): 0.8A
  • Operation temperature: -40oC .. +105oC


While using NOXEM 129 or NOXEM 130 NOx sensor emulator, the NOx level, emitted by the engine in some modes can differ from value, specified by the manufacturer. The user of the product assumes full responsibility for compliance with emission standards, valid in the country of use.


NOXEM restores the normal performance of the NOx system, which is one of the main conditions for correct engine performance. Affirmation for the successful performance of NOXEM – no new error messages regarding NOx sensor in the memory of MSD80/MSD81. However, NOXEM does not guarantee the excellent performance of the engine, if the engine has others, not related to NOx system, defects and/or the required coding procedures, as described here and here, after installing NOXEM are not performed correctly/not performed at all. If you have doubts, that your choice to buy NOXEM, is correct, please, get in touch with Bimmerprofs via e-mail and include an exact description of your problem: screenshots of the INPA error message list, live data, etc.
Bimmerprofs offers help with online diagnostics for customers. More information here.


Do not use aerosol type spray (brake cleaner, WD40 and similar) during replacement of the sensor! The fume of these sprays can damage the sensor! Remove the protective cap from the sensor directly before installation. If a spray is previously used, dry the surface using compressed air for several minutes.