Nox sensor problems

[AbdulBMWi3]

Hi everybody,
The 2017 model year E class w213 is mine.
When the engine warning light came on, we ran a diagnostic, which pinpointed problems with the upstream nox sensor.
I had the German-made nox sensor installed on my vehicle after ordering it online, but the check engine light returned about two hours later. They just sent me a new nox sensor, and I want to use it. A 0009053009 This is the sensor I imported from Germany; Mercedes' dealer has a different component with the same name but a higher price tag of A 000 9050914.
I'm fuming and at a loss for what to do; any suggestions?

[MercedesMan98]

You may be wondering why you should choose a German manufacturer over a nearby supplier.
If your emissions software was recently upgraded, you should get a new NOx sensor, and vice versa.
Due to obsolete components, the pn may be different.

locate a reliable merc indy.

[AbdulBMWi3]

Mercedes wants 500 pounds, so I had my local technician utilize Mercedes diagnostic equipment after we installed the sensor.

[MercedesMan98]

Hire an independent contractor. Any repairman may use a diags.

[AbdulBMWi3]

The cost of doing the diagnostic is 180£.
The diagnostics performed by my technician turned up the nox sensor upstream.

[William_Brown2000]

You may find many folks who have had the same issue with Nox sensors and the resulting high cost from Mercedes by searching this topic. Saving each client over £1,000 on diagnostics, the sensor, and installation must be a huge moneymaker for MB.