Hello audi world! I am an avid e46fanatics member and have now begun to work on my girlfriends 2002 A4 3.0 quattro and was hoping to get some advice and or assistance. I searched on DIY for the O2 sensors but could not locate anything.

Could someone point me in the direction of a diagram of the placement of the O2 sensors or even some pictures would be great. Any help appreciated.

Thanks!!

there are two. They are on the cat right behind the turbo. You can get to both from up top.

Thanks for the help
but There is not a turbo on the 3.0 model.

Oops. Long day I suppose. On the 3.0 there are two up near the headers and two down under the car.