The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern.Google+
Car Problem Reports
Mercedes-Benz S430 Brake Light Switch Failure May Cause ESP/BAS Warning Lights
Mercedes-Benz S430 Problem
Average Mileage: 106,800 mi (60,000 mi - 144,200 mi)
Visitor, 2004 Mercedes-Benz S430, 60,000 mi
MY BREAK LIGHT REAR DRIVER SIDE DOES NOT WORK. BUT THE FRONT DRIVER SIDE DOES, TRIED TO CHANGE THE LIGHT BULB BUT THIS DIDNT WORK SO DOES THAT MEAN I MAY NEED TO CHANGE THE WHOLE LIGHT ARE IS THERE SOMETHING ELSE I MAY NEED TO DO.
Visitor, 2000 Mercedes-Benz S430, 84,000 mi
ESP and ABS light stayed on. Its in the shop for the 3rd time. I am suggesting that they change the brake light switch.
Visitor, 2004 Mercedes-Benz S430
Bas and Esp warning lights are on my Mercedes.
BAS/ESP message lights would at times come on. More and more frequently. Replaced the Brake Light Switch,resolved this problem! Thanks