Failed on emissions

natt · 01-07-17, 07:42 AM

Hi guys. My B4 80 2.6 just failed it's mot on emissions, high co2. I suspect a vacuum leak. Does anyone have a diagram or link to a diagram for the vacuum pipes on the engine?
Many thanks.

Sent from my E6653 using Tapatalk

Sandro · 01-07-17, 10:42 PM

might be oxygen sensor most probably

missfire · 02-07-17, 07:48 AM

Some stuff here by the look of it, but not sure if the 2.6 and 2.8 are exaclty the same - https://www.audiworld.com/forums/12v...sited-2593199/

On the 2.8 I've got there is a dark green solid/plastic hose supplying vacuum and you can quite easily follow it branching off from there to the various components.

01-07-17, 10:42 PM	#2
Sandro Grown up member Join Date: Feb 2011 Location: Chelmsford Posts: 651	might be oxygen sensor most probably

02-07-17, 07:48 AM	#3
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,154	Some stuff here by the look of it, but not sure if the 2.6 and 2.8 are exaclty the same - https://www.audiworld.com/forums/12v...sited-2593199/ On the 2.8 I've got there is a dark green solid/plastic hose supplying vacuum and you can quite easily follow it branching off from there to the various components.