I have a 2003 Ford Focus and I had taken it into a ""chain store"" to get my check engine light looked at. They told me that I needed two '02 sensors installed in the exhaust. They did that and three days later, my check engine light had reappeared. Once I saw it was back on, I continued to take my car back to the chain store where they again told me to purchase two more '02 sensors, I had to remind them that they already had installed two sensors. They then said there was four all together; so I bought the other two sensors. AND GUESS WHAT?! My light, for the third time came back on. I went back to the chain store where they then informed me that I needed to purchase a new computer for my car. After spending close to a thousand dollars, they insisted that I needed to pay another $1400. And I was not having that. My friend told me about Compu-Tech Automotive where I found myself a true machanic who knew what he was talking about and fixed my car with no charge. It was not a '02 sensor problem, or a computer problem, but indeed a blown fuse! I am proud to say that Sam, owner of Compu-Tech, is the one and only person that I am going to continue to bring my car to for all my maintance sitsuations. I can not express how much I enjoy the awesome service Sam and his workers provide for me when I bring my car into the shop.