Alright, so I got my car back from the shop on friday. Before I had dropped off my car to the shop 2 weeks ago, the CEL had been on, and read error code 70 which is the fuel pressure bit, so I tightened the cap, and it didn't turn on again until I dropped it off. When I got it back, it was fine for a while, but eventually the CEL came back on. I remember that I had just gotten gas, so I pulled over, tightened the gas cap, and reset the ECU. It stayed off for a while, so on saturday I spent the day installing my stereo system. Then on the way home last night, the CEL came back on. When I got home I jumped the ECU and got code 67. "Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system". If anyone remembers, I hit a deer about 3 weeks ago. So yeah...wtf? one of my O2's crap out? Dead cat? Deer brains in my exhaust? yeah...