do you have an AFC? if so, you will get the "MAP RAN" (obd-2.com datalogger code for "manifold absolute pressure sensor out of range") CEL if it's not grounded properly. i get this one all the time, i just deal with it. i was a tard and grounded it to the chassis, and not 1cm or whatever you're suppose to do from the ground wire going to the ECU. i haven't gotten the motovation to fix it yet.