I came in because I had a code for misfire on cylinders 2 and 5 and I was due for a smog inspection. I had left my car for two days when they called and said I had a bad head gasket which would cost $2550.00. I asked if there was any way for my car to pass smog before the repair was done and he said there was no way and that they used the smog machine to confirm the diagnosis. When I picked up my car I had two new codes which they didn't mention. I'm not insinuating that they sabotaged my car, I just doubt that they ever ran their own code reader on it. I called my father and explained what they said. He told me to bring it up for him to take a look and that he would be very surprised if the head gaskets were bad. He ran a combustion test which tested fine so he proceeded to look for other causes. He replaced a sensor which I bought at Auto Zone for $21.99 in less than an hour. Today (3 days after picking up my car from Doctor of Motors), my car passed the smog inspection. Whether this was incompetence or an outright scam, I am clearly dissatisfied with the service. There is a huge discrepancy between $2500 and $25. *Update* Jesse called me on 01/12/15 (I had my car in on 01/08-01/09) in response to this review. He apologized several times and stated that he didn't want any of his customers to feel this way. He assured me that he would speak to his technicians and the owner to "get to the bottom of this." I am very interested in knowing exactly what was done to reach this diagnosis. It seems as if there were steps missed especially since my car had none of the symptoms associated with a blown head gasket (e.g. white smoke, missing coolant, milky white oil, overheating etc.) I will update again if/when I hear back from them.