Hi, I have a 2002 gxe 1.8L (72,000 miles) and the service engine light came on a few months ago. I had the O2 sensor replaced but the light keeps coming on. I've had 2 mechanics put it on the computer and no code comes up and it passes, but then we switch the light off and it comes back on a few miles down the road. I'm trying to sell the car, so I really want this dealt with. Any ideas???