W12 Lambda sensor Replacement Guide
 

Well my Bank 1 sensor 1 on the W12 failed and caused the cell to come on emmissions below threshold ect so i changed the sensor and it took me all of about 10 mins to do so hears how i did it.


first off remove the maf sensor followed by the air box it should look like this by now ...

http://i866.photobucket.com/albums/a...223_150033.jpg


Next i used a pair of plumbers grips to loosen off the sensor .. then unclip it and remove .. like this

http://i866.photobucket.com/albums/a...223_150038.jpg

http://i866.photobucket.com/albums/a...223_150135.jpg

and then the new sensor

http://i866.photobucket.com/albums/a...223_150131.jpg



now reverse the procedure ... and bingo .. no more cell light and better mpg again +++

hope its help full to people who are scared of tackeling the W12 themselves .... its not such a scary beast :ROFL:

Added to repair sticky +++

Blimey that was far too easy.... Sure the A8 4.2 is harder than that!

How's the codes now Guy?

can i do this for my 4.2 v8 d3?

Interesting discovery & solution db

I had heard it could be as much as £3k to change a Lambda probe on a W12 (depending upon which one it was that had failed) as it was an engine out job...scary indeed!

Can I ask how you identified which of the 8 probes(!) it was that had failed and what fault code was reported by VCDS?

Thanks & kind regards,
-=Glyn=-

well it was plugged into vag com and it stated bank 1 sensor 1 . but you can actually get to all 4 under the bonnet of course you have to take the air boxes out ect and to get at the rear ones its a bit tight but if you take the intake manifold off you can get at them both fairly easy.. engine out would be 4 new cats as you cant take the manifold off without the engine out i guess. but lambdas easy peezy +++

P2251

P0135

thats the codes i had +++