Posted by John Kennard on November 30, 2006, 1:51 pm, in reply to "1997 AUDI A3 1.6 AEH"
Hi John, forget Lamda its an irrelevant figure with high C.O. and High HC's it points to unburnt fuel the most important figure is O2 .3 is good & shows the cat is working using up the oxygen. I personally would look at plugs & make sure you fit Bosch. Don't forget to do a simple compression check in todays world of scanners we all hope to find the Holy Grail on a little screen or fault code. I would then possibly progress onto the MAF these don't always give a fault code. I hope these logical steps of elimination help. John Kennard.