I took my car to a Toyota dealership to get a diagnostics done, because she has been running poorly, especially at speeds lower than 40 mph. They came back with a bad downstream O2 sensor and a bad cam gear. After researching what a cam gear is, I can see where my timing being off would be the problem. My question is, if $1500 is a good price for replacing the cam gear. I had the O2 sensor replaced and I feel I paid too much for that, too, since my car runs worse since it was replaced. My other question is how much more are they going to try to rip me off. I ask this, because (1) I'm a woman and (2) I'm an elderly woman in my 60's and I'm afraid they will try to take advantage of me. I'm not sure the quote they gave me included a new timing chain. It's was just a flat price. I do know to ask just what's covered for that price, before repair is done, but I'm more worried about what they will come up with once the work is started and I want to be prepared. Thank you for your time. Any help would be greatly appreciated.