Amazingly knowledgeable and thorough. I had a 'check engine' problem. Peter spent time to identify the source of the problem instead of just replacing the front O2 sensor which the DTC code was indicating. Turned out it was a short in the rear O2 sensor causing the problem and once that was replaced the car ran fine. Another problem I had was the remote trunk release was not working. Again, Peter quickly identified a broken wire in the harness and rejoined it to fix the problem. I will definitely ask for Peter next time I need a mechanic.