Hi All

My friend has a 2007 R32 which recently developed a misfire issue. The dealer diagnosed it & we were told the oxygen sensor is faulty & $700 & 4 days later he got the car back. It was fine for about 2 weeks & same symptoms have re-occurred. The dealer is being very evasive about the fact that $700 has been spent with no benefit.

Can I throw out the question to those of you who know a lot more about VW's & mechanicals than I do to potential cause. My view is that if the O2 sensore fixed the problem for 2 weeks & has faulted again then something else must be causing that sensor to die.

Any help would be appreciated.