Nox sensor issue on E Class

[mohammed khan]

Tried 2 different nox sensors and reset done through special function on diagnostic tool but engine management light comes back after 10 miles drive and diagnostics show same fault codes as with orignal sensor.

Could it be wiring thats faulty?

Please see attached pics of fault codes.

Many thanks for any help.

 

[V6Matty]

That’s not the nox sensors but the heating elements, quite a difference I’m afraid. Get yourself to a reputable Mercedes Indy with online STAR to recheck and go into the values live to get to the root cause

 

[mohammed khan]

Thnaks for your reply. A bit tight on budget so trying to do DIY first. Would you know the paosisble causes?

Many thanks

 

[V6Matty]

If it is the heating element that’s failed (there are two), then it’s not a cheep repair, doable as diy if you really handy with the spanners, but I really think you need to spend a little and get a proper STAR diagnosis done rather than just read the codes, otherwise you could be throwing money at parts that aren’t actually needed and turn into begrudging the car because of it
Where are you located and maybe someone here can recommend a good Indy close by