I have a c220 cdi with 67000 on the clock. Twice the turbo has failed in that the vehicle loses power and slows down. Not clever in the overtaking lane of a motorway. A sensor was replaced first time and it is now in the garage to look at the second occurrance. Is there a history of this problem and what ids the solution?

My second problem relates to the fuel cap cover which has failed to unlock 3 times now. Again, is this common and is there a relaible fix?

Thanks
Kaibil