Quote Originally Posted by Hummer View Post
Sometimes a check engine light comes on due to a change in atmospheric conditions, at least on my old Tundra. Real mechanics here might have a different view. You can disconnect the negative cable from the battery to reset. If my check engine light comes on when I have a test scheduled, it's a quick fix and the test passes easily.
Modern cars will snitch you out. You need a few starts to be ready to test. Crafty bunch,