NOx Sensor Recalibration

[RatherUnknown]

I replaced the NOx sensor. Do I need to recalibrate it? When checking with Xentry, everything works except this option.

Enabling of signal of NOx sensor:
Value: NO
Specified value: YES

This is just an example photo of what it looks like.

 

[Mersovod]

Usually, when replacing, you need to collect trained values. But you can do without it. It will retrain itself.

 

[RatherUnknown]

So I just have to wait and see?

 

[BMGarage]

Xentry has a special procedure after NOx replacement. Do it and that's it.

 

[vlad0]

You need to reset the NOx sensor, they only start working under certain circumstances, you can check this with Xentry, but after 15-30 minutes of driving.

 

[RatherUnknown]

How do I reset the NOx sensor? Can you tell me? I searched in Xentry but found nothing... I can't find anything on the Internet.

 

[Mersovod]

Initialization and training processes after replacing design units in the coding menu or special procedures.

 

[RatherUnknown]

Can anyone help me? Where can I find these settings? This is a E200 Coupe 2015 facelift M274.

 

[vlad0]

Apparently on your type of ECU you need SCN after replacing the NOx sensor.

 

[lordmetro]

Yes, it depends on the car. I only know from personal experience with the W205.
NOx sensors after Gen3/4/5 are "patched" and require MB Diesel Emissions Update, which uses a different algorithm.
Gen1/2 are not compatible with Gen3+ software versions. These older sensors manipulated values in the system.
It is always best to replace the NOx with the same version of the control unit that was installed on the car to avoid having to change the software, although Gen3+ sensors with updated software are more reliable.
NOx sensors can be car specific, although I put a W177 NOx in a W205 as a test and it worked for 6 months before dying. It worked because the car had Gen2 and a patch.