Recently purchased a Audi 2007 A4 2.0tfsi S-line SE which currently has 56000 miles on the clock. After reading a few common faults, I decided to change the following as a precautionary measure.
-HPFP cam follower
-PCV valve along with the smaller of the 2 hoses
-DV to be replaced soon
Car runs perfectly normal,idle is smooth and is where it should be, I get around 350-400 miles to a tank of fuel which I think is about right. No fault codes.
My concern is when I removed the oil filler cap today there was a slight hissing sound and the idle went rough, is this normal.
There is no oil around the filler cap. The oil filler cap was not difficult to remove.