Hello. I have a6 2005 2.0tdi bre. Suddenly i got engine check light and lost power. If i turn off a car and leave it for a while i have a power again for a few minutes and then its gone again. It looks like turbo stops and theres no boost. I can reach high speeds but without boost. Scanned and there was only 2 faults. Egr valve n18 and egr sensor 2. Changed to another egr valve but its still the same. Any ideas?
