Quote:
Originally Posted by floydarogers
I just had both my NOx sensors replaced; $1800 after BMWCCA discount. Unfortunately the SES has come on again - I'm about ready to go down to see what it is. My guess is that it's the SCR catalyst (that's the NEXT thing they replace after the sensors.)
I've had the oil leak problem; about the same price.
70K is a bit early for NOx sensors and catalyst to fail, BTW. Poor consolation.  |
floydarogers, next time you decide to blow almost 2k on a set of another perfectly good NOx sensors, please give me a call and I can lend you mine that are sitting in a box. Will even drive them to Everett or somewhere. Really hope you kept your old ones at least.
Why do you guys start with the difficult and expensive, where the urea tank flush along with a nozzle rinse should be the first to try. I bet your SCR is fine as well. The only thing that can affect it is contamination, and unless you are blowing soot through it, you can only have crystallized urea in it. Water dissolves the urea, btw. Urea is funny, it has a 6 mos shelf life, so past that, expect to have issues, shorter in hotter climates.
Please clean your urea nozzle and see what changes...