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 C240 Brake Light Switch Failure May Cause ESP/BAS Warning Lights
Mercedes-Benz C240 Problem
Average Mileage: 72,625 mi (39,500 mi - 130,000 mi)
Visitor, 2001 Mercedes-Benz C240, 65,000 mi
Where is location of brake ligth switch on mercedes bez c240 2001 model
esp and bas malfunction lights come on at will, then reset when car shut off. Sometimes, this does not happen for weeks, then almost everyday, then is stops again for long periods.