Emissions Fail WTF????

[scoobyra]

My car failed EVERY single emission test today!! Engine light is on but can't get it plugged in to vagcom until next week.

Any ideas people??

 

[liquids3]

Have you got decat (sportscat),if not mayby lambda gone down,theres one befor and after downpipe!,beat to vagcom!!

 

[scoobyra]

Nope, standard exhaust all the way through

 

[liquids3]

Id say at a quess second lambda probe!,try diagnostics if you cant locate vagcom,about £80 i think for the second one!

 

[Sandip]

Quite common for S3's to struggle on emissions, the hotter you get the cats the more efficiently they'll work. They don't get hot enough when when stood at idle in the m.o.t station

Take the car for a good hard drive then get it tested straight after, it should be fine! :icon_thumright:

Pre cat lambda is the one that has a part to play in fuelling/emissions. Post cat lambda is simply there to have a quick sniff to make sure the cats are working