I have a '01 sc2 dohc and the "check engine" light comes on every 4 weeks. I went to auto zone and checked out the code and it said that there was a evap system leak(small) I've had my mechanic check the system involved and they said that everything looked good. Does anybody have any idea of what else could be trpping the sensor? I'm thinking 02 sensors? By the way, I replaced the gas cap and it came on again after a few weeks.Edited by: branded34

http://www.saturnfans.com/forums/showthread.php?t=44822is a link to a page listing all the Saturn specific codes. Look up DTC 0422 and it shows a different interpretation. Search the site for more information.