C class 250 d

[aliyahk1967]

I have had my nox sensor changed 3 times by mb due to a recall after each time changed the EML kept coming back on so after the last time changed they stated it was the last.Few months later the EML is back on showing nox sensor fault has anyone elese had this problem

 

[Blobcat]

Hello and welcome

Quite common and quite a few threads on here that should help you, please have a search.

 

[dry run]

Welcome Hope you get it sorted

 

[Rotorhead500]

As per Blobcat, quite a bit of info on threads here, should give you a good steer.

I'd also, politely but firmly, suggest to your dealer that if they've changed 3 sensors, either the sensors are not "fit for purpose", or they haven't actually diagnosed the problem correctly in the first place, hence it keeps coming back! (If you really want to wind them up, ask them what they determined the root cause of failure to be on their first attempts... see what they come back with!)

Majority of main dealers are either completely hopeless at diagnosing faults, and/or will belligerently ignore known faults to try and save themselves money/hassle, in the vain hope you go away.