Timothy was terrific, highly knowledgeable and very personable. I had scheduled an appointment to have my daughter's O2 sensors replaced, but after he got here and assessed the situation, he said that we didn't need them replaced. He cleaned out a few areas that might have been causing the problem which reset the check engine light. I didn't get charged for anything except a diagnostic and the gas treatment he put in the car. The repair shop we had originally checked with had said the sensors needed replacing and quoted us $400 to do so and I'm sure if we had gone there instead of with Timothy, they would have been replaced without actually fixing the problem. Timothy was up front about everything he was doing in the car and gave us a list of possible upcoming maintenance items. I loved the service and will definitely use it again.