Hey guys, After the saga with the rear diff on my previous S3 plaguing me, it seems that the S4 is (kind of) following suit. Car was showing intermittent PCV valve malfunction error codes pretty much as soon as I bought it 3 months ago (mechanic friend scanned it 2 weeks after buying). Car went in for recall work and the fault was identified but everything was tested and appeared to work correctly. I took out Audi extended warranty on the day I put the deposit down on the car, though it doesn't start for 30 days. Fault date stored in the car is between purchasing the car and the warranty starting, so claim has been rejected as a pre-existing fault. I'm either very unlucky and the fault manifested itself in the uninsured period, or the fault was there and not picked up by the checks carried out by the dealer that sold me the car. Is the PCV valve a common issue with these cars? Quoted north of £1,200 for replacement of the valve at Audi, talking to the dealer that sold me the car on Monday.