pkirby

Coming up on 80k on my 02 S8, while I'm changing the p;ugs thought I'd change out the pre-cats. Good idea or don't bother ?

boonies

I think it is worth doing...but a real PIA.

My passenger side 02 sensor started giving intermitant problems at around 60k.

I found the attached link to be very helpful.<ul><li><a href="https://forums.audiworld.com/a8/msgs/170203.phtml">https://forums.audiworld.com/a8/msgs/170203.phtml</a</li></ul>

tozoM8

It is probably easier just to remove the down pipe and change it on the bench.

jfrahm

It's not too hard with the right kind of O2 sensor socket, extensions, etc.

jfrahm

Amazon.com has a good price on O2 sensors and free shipping too.<ul><li><a href="https://forums.audiworld.com/a8/msgs/168776.phtml">D2 A8 O2 Sensor replacement</a></li></ul>