You can clear the CEL by disconnecting the battery for about 20 minutes. But make sure you have the radio code and you may have to reset the power windows. The windows part is in the owners manual. You can just replace the AMM and if that fixed the problem, I think the check engine light will go out after about 40 or so drive cycles. You know, cold start, everyday highway and city driving , acceleration, deceleration, then coolant cooldown to under 100 degrees F. to start another cycle. I could be wrong, but I think that is what it takes, and disconnecting the battery gives immediate gratification. Plus clearing the ECU sets the computer's long and short fuel trims to default. After I changed the AMM I disconnected the battery, and the CEL has been out for 2 months. It took 2 days for all the I/M monitors to go ready, but they all did and I smogged here in California no problem.