O2 sensers
 

Is it a diffucult task to replace the O2 sensers on a B5 S4?

How long does it take?

Thanks for any input you may have!

the one behind the engine is a little bit of a pain but the rear 02's are easy. 30min job.

my car has been throwing the O2 sensor code too, however i have found a tutorial on how to change them, personally i have attempted it yet cause i want to figure out the prob in my SAI system first but here it is, good luck let me know how it went for you

http://forums.audiworld.com/showthread.php?t=2775139

Rears are no big deal. Primaries are a pain in the ass. When I did them for a guy, it was a matter of using swivels and 2-3' of extensions, carving up my arms on a ton of sharp brackets, and reaching to hold parts with fingertips buried way in under and behind the engine. To get the driver side sensor out, I had to attack from the passenger side, and vice versa. Took some time for sure and was a pain in the ass but it's doable.

it's really not too bad... have a long extension, special tool for o2 sensor(crows foot type works best) and ur good to go...passenger side only takes like 5 mins! ....other side is a bit harder to access but it's really not a big deal...same with the egt's