The owner of this business claims there is no machine that you can hook up to your car and diagnose it.....it's a myth....It's all in what the mechanic can see. I wonder if he knows about the On board diagnistics. He claimed my car did not have one, which is not true. He claimed I needed valve stems seals in order to pass smog, without ever looking. In fact, my car passed smog with some simple spark plug wires. Cost me over 300 dollars for a radiator that sprung a leak while they were working on it. DO NOT GO THERE!!!!