Have 1988 300 SEL. The first time I step on the brake pedal after starting, the check engine light comes on and won't go out until I turn the car off. As long as I don't step on the brake the check engine light will not go on. I've driven 1.5 hrs down the interstate without steppingon the brake and the light stays off, when I exit and step on the brake the light comes on.


Jim