On my 1989 300se.I can start the car in park. No need to depress the brake to start the engine.like I said.the cel comes on only when I apply the brake.car has not been to a shop.bulbs all work.if I start the car no light.once I apply brake pedal light comes on and remains on until I shut her down.I can restart in park and put her in drive on flat ground without touching the brake and drive with no check engine light.but once I apply brakes light comes on?