Just to say hi fellow s3 owners, and need some advice on emissions/ Lambda sensors
So Ive been a member of audi-sport for a while now and thought its about time I said Hi!
Firstly, what a great forum! I joined it whilst looking for an S3 and its been great help ever since. Some brilliant advice on here and inspiring builds.
I picked up my AMK s3 exactly 6months ago and absolutely love it! Heres a pic of her when I first got it:
Since owning the car Ive done a few subtle mods like wrapping the grill surround and the lower door blades, Ive had it on the dyno and despite having 175000 miles its still got near enough its factory power! Ive been hit by a pr*ck romanian lorry driver and been declined anti corrosion warranty at coventry audi :( Ive also recently done a full service including removing the sump and replacing the pick up pipe (thanks for the excellent, in depth how to's!) Theres plenty more Id like to do but probably best to get eduacation out the way first and get some proper funds in :/
Anyway last week I took the car in for its MOT, it passed everything bar the dreaded emissions! :( Ive done the complete service, put a bottle of cat-a-clean through the system and got it nice n hot but still no luck. these are the results:
If the car is revved hard the CO emissions drop to under the pass percentage but dont stay there for long before climbing again.
Its not displaying any faut codes on the diagnostic machine and the engine management light isnt on. Both the Lambda sensors are recieving a voltage from the ecu but dont appear to be adjusting the fueling :s the heater element is on- off on the pre lambda but occasionally flickers on the post lambda.
Im a bit stumped now whether to replace the cat, pre or post lambda or the whole lot?
If anyone has any ideas theyd be much appreciated!