Savo

Hello guys,
I have the 2015 E220 Bluetec coupe diesel.
My check engine light came on today and after checking it came out to be the NOX sensor (code P2201). The funny thing is that i have replaced that sensor last July. How is that even possible?

Im taking it to the dealership next week. Did anyone have the same thing? Any advice on what might causing the fault and what to tell the dealership to check to find the root of the problem?

Thank you

Plutoe

To do it correctly, the dealer will do a quick test and he will confirm what part is faulty---why, it's an electronic part and they fail. Assuming the dealer did the work the first time, parts are usually warranted for 12 months and although its longer than 12 months the dealership may offer some compassion!

Stephen Chin

My 2015 w212 E220 bluetec CEL came on with fault code P2201. There's 2 NOx sensor..one with a longer wiring and the other shorter. Which one did you replaced.

RiverX

Hello, Guys,
My ML350 Bluetec 2014 engine light on with P2201, Bank1s2 and Bank1S3 related. Just wondering how much is this going to cost potentially? Why there is no Bank1S1?
What are the location of them? and only dealership can do this work properly since a teach-in process or a ECU training is required after the installation?
Thanks in advance for your answers!

400ixl

Any indie with access to Star diagnostics can do this. I would recommend using genuine parts (or the OEM supplier if you can find that out).

RiverX

Thanks, So you mean the Star diagnostics scanner/device can do the NOx sensor training, and also other relearn and train jobs?

400ixl

No such requirement for replacing that sensor that I know of. But yes, Star is what the main dealer would use.

Also assuming you mean one of the O2 sensors (pre and post catalytic converter) rather than NoX.