I went to get my car smog tested so I could get a new inspection sticker. "Service engine" light came on. He had to keep the car for a day and a half to fix a misfiring cylinder and determine by process of elimination the "service engine" light was caused by a dirty fuel injector. He recommended some cleaner ($5) from another auto parts store, and said I could leave and WAIT to PAY until the service engine light went off and I came back for the smog inspection. After running my car with the injector cleaner over the weekend the light went off and hasn't been on since. He also had one of his people give me a ride back to my house when he first took my car. Really great service. I would recommend this place to anyone.