Competency issues
Peter seems assertive and very confident.
My VW Beetle was behaving strangely, and I picked him as a potential specialist.
He was honestly declaring my car will run much better after his intervention. I did 3 visits, and the bills were large each time. He replaced lots of stuff.
Yet, my car did not get better.
Ultimately I went to another mechanic, and he easily found and fixed the problem.