Strange thing happened today. I was racing my brother down the interstate he has a acura tl. Needless to say he got the jump and that was it. By the time I hit third he couldn't believe that my caddie moved like that. Anyway as we exited off and pulled into a parking lot I was revving the motor and bragging and then I shut the car off and started talking. Once I left about 5min into my drive my sevice engine light came on and my heart skipped a beat. I pulled over and with the car still running I checked the codes and got a p0151 for a heated O2 sensor low voltage. As with some of these codes I have no idea what they mean. The car drives fine. Is this a problem leading to a bigger problem or nothing to worry about. For the past week I've been driving the s&*t out of the car. I also got a code for the massiveairflow sensor P0101. This only comes up on a WOT. the strange thing is once the code appears the tranny shifts like its suped up I mean catching gears like my Regal. Is this common?:hmm: