I bought it 2 years ago its been fine i drove 20k in two years once a adblue low level came on i filled that up that time.last week first engine light came on then next day adblue warnning came on (eng start not possible in 487)i dnt wana take it to back to mb dealers .so its needs nox sensorHi,
If the Adblue level was correct then this is almost certainly due to a NOX Sensor failure.
If the warning message haunt changed yet expect it to change to something like Adblue system failure engine start not possible in and it will countdown from 500 miles,
This is very common apparently, mine went on my E350CDI 65 plate, mine were both replaced FOC by MB.
Has youre car been recalled for an Engine ECU update? As there is reason to think that this can cause these sensors to fail prematurely, hence why a lot of owners seemed to be getting them replaced under goodwill/warranty.
Its never called for-recall og engine software since i bought itHi
As above get the diagnosis confirmed, if you don't want to go to the dealer then make sure whoever does it has online STAR so can update any software with regard to this as it almost certainly require one once a new sensor is fitted.
Has the car received a recall notice for engine software?