A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

O2 sensors

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Old Apr 7, 2009 | 08:01 AM
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Default O2 sensors

I'm sorry to post twice, but I think I used wrong section earlier.

I would like finally to replace the O2 sensors in the 3.0L AVK engine. It seems, it might be fairly easy to replace the post-CAT sensors, since they can be reached to from the top. I would like to ask how to replace the pre-CAT sensors. I looked from the bottom of the car, and I see they are located in a 45 degree angle and blocked by the engine supporting frame. There is some space, but very limited. Is there any way to replace them without removing transmission? Many thanks for suggestions.
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