My Mazda 5 had a CEL come on and Jerzy was recommended to us by a friend. We took our car in and Jerzy explained some owners don't fill up until the tank is empty and this can cause the charcoal to expand and contract more than it was designed for and over time cause issues which tripped the sensor. He was very easy to work with, seemed very honest (which is rare these days) and was quick on the repair. Since our car is now out of warranty, it's nice to know we have an indy shop to take it to so we can avoid the dealership service department prices and BS. (Don't get me started on Pep Boys who grossly overcharge on labour. ) He also gave us advice when looking at some used cars, he's a great guy, highly recommend his services.