My car is intermittently suffering from misfires (registered DTCs and CEL coming on) - Its in the Audi dealers today to take a look but I said can you just change the spark plugs under warranty, but unfortunately they say these are not covered after the car is more than 3 months old.

I know the plugs on a S3 are meant to be changed at 40K miles but I am almost 15K from that - If they wont change them I will most likely ask them to change them anyway (at cost to me which doesnt seem right)

Probably is true but anyone know different?

PS I have already had it in once (had a new MAF) and they said coils/plugs were fine