Hi all, well had the s4 for a few months now and still so pleased however I have noticed that the left exhaust pipe gets very black and sooty quickly where as the right hand one seems to stay pretty clean. Anyone have any idea why this might be happening? Does one do more work than the other or may it indicate that a sensor has gone bad causing it? I plan to get it down to the specialist I use when i get a chance and no doubt they will stick it on vag com but just thought I would see if any one else has had this issue.
Other than a slightly noisy fuel pump, I cant really fault it, car seems to run fine and check oil level religiously every week. Any ideas appreciated.