Well i got the car back along with the repair papers and it turned out to be the Vanos Solenoid that was replaced. That is a pretty good stretch from exhaust filter wouldnt you say? They also flushed the brake fluid, replaced the windshield wipers and checked the other levels.
Enjoying an E89 Z4, F30 330i and Fiat Pop 500 //
E85 Z4 (sold), E82 128i (sold)