alternative NOx Sensor / emulator

11787587129 (actual release)






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

BMW | E60 LCI, E61 LCI with N53 and N43 series petrol engine

BMW | E63 LCI, E64 LCI, E90, E90 LCI, E91, E91 LCI, E92, E92 LCI, E93, E93 LCI with N53 series petrol engine

  • 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
  • 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

Attention! The probe (sensor) is NOT included in the set; it should be purchased separately.

NOXEM KIT is for you, if:

  •  you are a VIP customer of some spare part sellers, and you have better conditions
    for the warranty of the probes as Bimmerprofs can offer;
  •  you have stock of the appropriate probes from motorsport or another project;
  •  you are using your car in motorsport, off-road, or in other specific conditions with a
    significant probability of mechanical damaging the probe;
  •  you are using your car rarely or for short distances, and it is a significant possibility
    that the water condensation will damage the probe;
  •  if your car has problems with the injectors, but you believe that more cost-effective
    is replace the NOXEM sensor when it gets damaged;
  •  you want complete independence from everyone – NOXEM KIT will ensure you

Whatever the reason for the probe damage, you will be able to replace it in 15

Probes that can be used:

  •  Bosch LSU 4.9 Motorsport. Bosch code: 0 258 017 025
  •  probes, intended for BMW. BMW codes: 11787558054; 11787561409
  •  probes, intended for BMW. Bosch codes: 0 258 017 100; 0 258 017 110
  •  other Bosch probes. Bosch codes: 0 258 017 098; 0 258 017 099; etc.

Note: if you are using probes mentioned in points b .. d, before installing the probe,
break the security key in the plug of the probe, using the pliers or the screwdriver.

Note: if you are using other probes (point d), pay attention to the length of the wire!

Where to purchase the probe?

  •  at the closest shop of the car spare parts;
  •  at the Bosch dealer or reseller
  •  from some reliable spare part seller on the Internet.     

Note: avoid offers of cheap probes! Parameters of cheap analogs are significantly different from the defined standard of LSU 4.9; such probes can NOT be used in

What kind of Thread insert to use? 

The size of the OEM NOx sensor is M20 X 1.5mm, but the size of the Bosch LSU 4.9
sensor is M18 X 1.5mm. To screw the LSU 4.9 in the exhaust, we use Thread insert
M18 X 1.5 to M20 X 1.5.

On the Internet, the following Thread inserts could be purchased:

  •  VS5281R
  •  BGS 66215-1
  •  any other Tread insert, which corresponds to the size (M18 to M20 X 1.5)

NOXEM. Introduction

How to use NOXEM. Part - 1

How to use NOXEM. Part - 2



Afected vehicles

Reason for replacement

Following NOx sensor error messages:

2AEC Nitrogen Oxide Sensor Self Diagnostics

2AF0; 2B05 nitric oxide sensor, heating

2AF2; 2B06; 2B09 nitric oxide sensor, Lambda linear

2AF4; 2B07; 2B0A NOx sensor, electrical

2AF6; 2AFB; 2B0B nitric oxide sensor, Lambda binary

2AF9 nox sensor, nox signal: coast mode check

2EAE NOx sensor message missing (timeout)

30D6 nitric oxide sensor, plausibility

30D8 NOx sensor, Sensor damaged

30DA NOx sensor, heating time

30DC nitric oxide sensor, heating

30DE NOx sensor – Lambdaprobe before catalyst, Korrelation

30E0 NOx sensor, Offset

30E2 nitric oxide sensor, thrust test

30E4 nitric oxide sensor, aging

30E6 nitric oxide sensor, dynamics

Following NOx catalytic converter error messages

30E9 nitric oxide catalytic converter, aging

30EA nitric oxide catalytic converter, sulphurized*

*if an error appears repeatedly and/or forced desulfurization is not possible/successful

Following live data

NOx concentration is 0 ppm**

(INPA data | NOx Sensor / Exhaust temperature menu) after:

  • the engine is warmed up
  • exhaust temperature is more than 220 oC
  • driving speed exceeds 20 km/h for more than 2 min

**continuously or periodically: the sensor is damaged

NOXEM series NOx emulator KIT is built using the highest quality components

  • 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.