Tire Choice review: Auto repair 2

If you want to be robbed, this is the place to go. Went in to get an oil / filter change, basically to cover me until we decide to trade it in. Told clerk engine light was on, and has been for 3 years, but no problems. Didn't want to spend hundreds for a diagnostic. Clerk told me if I was thinking about keeping it instead of trading, diagnostic would only be $100, and would tell me why light was always on. Results came back stating if I did $2600 in work, light would be off, truck would last years more and I could keep it instead of trade. Did the work, got new tires and, a few days after, light came back on. Asked why they did all that work that obviously didn't need to be done, because it did not fix what they said it would, clerk tried to blame new problem as the cause, actually trying to convince me that this new problem just happened to start, right after they did neccessary work.