my CEL came on a few days ago, i didn't know what was wrong with it.. so i had it checked out... it pulled a code P1457. i had installed AEM CAI last week, the CEL didn't come on at all.. since the CAI i've done oil change.. that's about it. I've also check the vaccum lines to make sure they are connected properly.. and they are.. so any help would be appreciated.

 

have you tried resetting the ECU to see that maybe it's a fluke? If the CEL comes on again and you get the same code, then there might be reason for concern.