NOx emulator NOXEM 129 | 130 | 402 developed for BMW N43 & N53 series engines

alternative for OEM NOx sensors 11787587129 | 11787587130 | 11787590402

solves problems with NOx catalytic converter and NOx sensor

NOXEM series NOx emulator will restore the initial power, economy and smooth run of your car’s engine!

If you drive BMW with petrol N43/N53 series engine and the engine

  • runs unevenly in idle and/or on the go, in cold and/or hot condition;
  • the fuel consumption is higher than it used to be,

pay attention to error messages stored in engine control unit. If the error messages regarding NOx system

  • NOx catalytic converter aging and/or sulphurising: 30E9 and/or 30EA (E series) or 180401 (F series),
  • defects of NOx sensor: 2EAE; 30DA; 30E0; 30E4 (E series); 12C704; 12C208 (F series), etc., are stored,

replace OEM NOx sensor with NOXEM series NOx emulator!

The original NOx sensor costs at least EUR 450, NOx catalytic converter – EUR 2000 .. 3000, a lifetime of both items typically do not exceed 100’000 km.

Cost of NOXEM NOx emulator is lower than the cost of NOx sensor, the average lifetime of it – at least 300’000 km, and there is no need to replace the expensive NOx catalytic converter! In addition – thanks to lower fuel consumption, NOXEM NOx emulator will fully pay back after 30’000 .. 40’000 km. 

The installation of NOXEM NOx emulator is quick and simple, it doesn’t require intervention in the electronics and exhaust system. You will be able to switch back to original exhaust solution any moment, if you will decide to do that.

Here you can find detailed information about a most popular N43/N53 series engine problem and here – how to check NOx system performance.

To each BMW enthusiast, we offer Online diagnostics for BMW E series N43/N53 engines. Detailed information here.


Attention! NOXEM restores normal performance of NOx system, which is one of the main conditions for correct engine performance. Affirmation for successful performance of NOXEM – no new error messages regarding NOx sensor in the memory of MSD80/MSD81/MSD87. 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 INPA error message list, live data etc.
Bimmerprofs offers help with online diagnostics for BMW E series customers. For more information click here.

Note: Problems with NOx system (NOx sensor and/or NOx catalytic converter) usually are the reason of following errors (E series; typical situation):

  • 29CD .. 29D2: misfires of Xth cylinder;
  • 29F4; 29F5: efficiency of CO converter below threshold, Bank 1/2.

Also, error messages regarding fuel trim usually appears. Problems with NOx system also can be the reason of: error messages relating (individual or all) cylinders misfires; low efficiency of CO catalytic converter, 1st/2nd Bank; Lambda probes; incorrect fuel trim (cylinders individual or Bank).

List of affected vehicles

List of NOx system error messages

How to evaluate performance of NOx sensor

Replacement of NOx sensor

FAQ about NOXEM series NOx emulator

How to install NOx emulator. Introduction

Detailed information about NOx system problems

How to check condition of NOx system

Components of NOx system

INPA: basic info from error message list



Reduce fuel consumption by 15 .. 20%

Compared with engine with problems (errors) relating to NOx catalytic converter and/or NOx sensor


Restore smooth operation on idle and at low load

Re-enable offset type LTFT at idle and cylinders individual mechanical and fuel mixture corrections


Restore smooth operation at mid/high loads

Re-enable normal operation of multiplicative type LTFT and cylinders individual fuel trims


Facilitates the start of a cold engine

Re-enable additional cold engine LTFT

No more problems and inexplicable error messages relating fuel trim, misfire, CO catalytic converters

Thanks to restored normal operation – no more never ending replacement of injectors, ignition coils and spark plugs


Error-free memory of MSD80 engine management system

No more errors relating NOx catalytic converter nor NOx sensor: correct real-time operation restored


NOXEM series NOx emulator is built using the highest quality components



  • Bosch latest generation sensor controlled and measured by ourselves developed analogue control module provides 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 highest resistance to car’s on-board voltage spikes
  • High precision reference frequency oscillator and industrial temperature grade components provide uninterruptible operation in wide temperature range
  • High power oversized sensor control stage reduce heating and facilitate operation of electronics module at high temperatures
  • Double sealed construction with 5mm stainless steal base plate is 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


What is the difference between NOXEM NOx emulator and OEM NOx sensor?

What are the main differences between NOXEM emulator and ‘’usual’’ emulators?

Is NOXEM safe for my car?…


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