"When it came time for expensive repair, they would not "guess" at the solution. No work unless they are sure." I brought them my 2007 Dodge Charger Daytona that had been throwing P0130 (upstream left) O2 sensor codes. I do 90% of my own repairs, so I performed a series of repairs/replacments on my own and could not resolve the problem. Time to send the car to someone with better analysis tools! The techs at Folsom Auto Center analyzed the situation, chalked it up to a bad connector, serviced that, charged a reasonable amount for the labor, and gave the car back to me. Being intimately familiar with the car, I was not sure they had found the cure so easily. Sure enough, the code came back on the trip home. The next week I brought the car back to give them a second shot at it. Their analysis pointed to replacement of the PCM (ECM) (a.k.a. computer), an $800 repair, but since they were not absolutely positive that this was the solution, they did nothing. They reported their findings to me, showed me the scanner data (all 4 O2 sensors flat-lined simultaneously), and the ALLDATA solution (replace computer), charged no labor for what I believe to be at least 2 hours of tech time, and referred me to the dealer for a final determination that this was the correct cure. I applaud FAC for not guessing! I will bring my incurable cars to them in the future.