I had my car at the dealer about a month ago to diagnose my CEL on my celica. It was my O2 sensor. I also wanted them to check my tranny out because it grinds at high RPMS going into 2nd gear. I asked them to have a technician drive it. They said there was nothing wrong. They dont insist on a technician driving while i sit in the passenger seat. What should i do next? I have 1500 miles left on my 60000 mile warranty....what to do!