It’s state inspection time and you’re ready to leave bright and early for the inspection station with the family’s ’98 minivan. You’re starting the day in a less than jovial mood because your daughter said “the light came on” last night on the way home. She said she threw a few dollars of gas into the tank to make it home. Turns out your annoyance is misplaced. Sure enough, the light’s on all right, but it’s not the fuel warning, it’s the Check Engine warning. You stop for gas anyway, and then you pull into the inspection lane.
Well, full tank or not, the minivan does not pass muster.
Now what? This Instructable will help you use scan tools to diagnose your car's problems. You can do the basics yourself before taking the car in to a mechanic.
This project was originally published in the August 2001 issue of Popular Mechanics
. You can find more great projects at Popular Mechanics DIY Central