dgkula

I thought (from having STFA) that only the pre-cat affects engine performance and that the post-cat is just emissions-related.

I have had 2 DTCs for some time and was not planning to replace the B1 S2 sensor until it was dead and caused a CEL:

16524 - Oxygen (Lambda) Sensor B1 S2: No Activity
P0140 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent

Tech saw the DTCs on the printout which has the "Charge Pressure Control: Negative Deviation" DTC as he is doing a pressure test - and has located the leak that was evading me while replacing vac lines!! Yes!!

Is there any good reason to replace the B1 S2 sensor now? Or should I just wait for it to fail for good as originally planned?

Thanks,
David

pac1085

ive been driving around for a while now without that sensor even plugged in. no problems

Ray Khan

if it were me, I would replace it. I just bothers me to know something is wrong like that. The problem with having a CEL and thinking you know what its for is that something else could come along and you wouldn't know. Too bad the VW sensor are $90 now. I use the front one in the rear position with no problems. They usd to be $25

WJM

that IS failed...

Silver Streakin'

the kit so that I don't have to do this:<ul><li><a href="https://forums.audiworld.com/s4/msgs/2128854.phtml">https://forums.audiworld.com/s4/msgs/2128854.phtml</a</li></ul>

dgkula

I also have a knock sensor DTC that I would like to get rid of - I dream of a day with no DTCs and I only have 3 now - but want to focus the cash on some mods for the time being

Ray Khan

that should be a sub $100 part. I would do that before the 02 sensor for sure.

dgkula

Thanks - that sounds worth spending $$ on!