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Old 16th June 2014, 09:04 AM
richyb66 richyb66 is offline
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Join Date: Jan 2011
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Assuming it's similar to the 40v S6, the post at lambdas are below the handbrake but the pre-cat ones are in the exhaust downpipe close to the cylinder head.

The pre-cat lambdas aren't easy to get to in-situ, there might well be a special tool to get to them but I've not got it, the post cat ones are fairly easy to get to though. Personally, if I was swapping the pre-cat sensors, I'd drop the down pipe off the car.

This is how I did it on my S6, S8 should be broadly similar??

http://forum.a8parts.co.uk/showthread.php?t=4834

Last edited by richyb66; 16th June 2014 at 09:10 AM.
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