Anyone know where b2s1 oxygen sensor is on 2000 audi s4?

i know it is driver side pre-cat but where can i look for it?Anyone know where b2s1 oxygen sensor is on 2000 audi s4?If you move the coolant reservoir to the side you will be better able to see it from the engine bay top. It's a little tricky but you can remove and replace it from the top of the engine side (I did it a few weeks back).Anyone know where b2s1 oxygen sensor is on 2000 audi s4?It is on the exhaust pipe right after the two pipes combine into one when leaving the engine.

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