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Thx @Attacking Mid

Need to find out if I can change the NOX sensor myself. There are 2 and each costs 500+.

Forum members- Has anyone here changed the NOX sensor DIY? How easy difficult it is?
NOx sensors have to be calibrated. Also, be ready for some more bad news. NOx sensors are like O2 sensors, they have to agree. Best approach is both sensors to be replaced. But, wait, there is more: your SCR cat might be culprit or DEF injector. If they don’t do their job properly, it might show as bad NOx sensor.

Passive tank level sensor? Just put resistor and make sure you always have DEF.


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Well, if you can clean it, it would not hurt I guess. My SCR cat died right around that mileage. BMW thought sensors were an issue, but it turned out to be SCR cat.


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