X5 diesel engine noise - With VID.

[bawareca]

Originally Posted by ard

In air leak can cause odd noised under various running conditions as air if forced through a orifice (think wind instruments) ...AND...unmetered air entering the engine can ALSO cause the DDE to think you are getting erroneous NOX readings and trip codes.

I would NEVER think a code that says "nox sensor" means unequivocally that the nox sensor is bad. Never. Good guess perhaps, but not the only thing that can trip codes.

my 2 cents

I didnt hear anyone here replacing the NOX sensor. And why will both (?) fail at once?