Quote:
Originally Posted by blue dragon
The metering valve is also inexpensive. I've had to change mine already, so I'd try changing that before changing the nox sensor. Search for Rheingold on torrents, and run the diagnostic test plans
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Good point about the metering valve!!!
Blue Dragon and
ninja zx11 did a great job documenting it and how to test the metering valve. You can read about it here:
Reducing agent metering valve actuation fault. - Bimmerfest - BMW Forums
Note that the code for them was different, but I would still test it to see how the resistance of your compares to that of a new one.