What’s your reaction when the “Check Engine” light goes on while you are driving your car? Do you immediately head to your local mechanic to have it diagnosed? Are you a DIYer who stops by the local auto parts supplier to get a free scan, or perhaps you own your own OBD2 scanner and use it to retrieve the error codes? Or, do you just continue to drive around hoping that it will eventually go out? The problem with that is the light usually doesn't go out – it just stays on, glowing at you as if to say “Hey, we have a problem here…..don’t ignore me!!!” I've known some people who cover it with tape just to feel less guilty.