I replaced the brake light switch to turn off the ESP/ABS warning lights and it worked. Unfortunately they came back on late last night. They'd been off for over a day and were off when I parked the an for an hour. When restarted it they came back on. My mechanic scanned for codes. There are a few pending codes for other things like an O2 sensor, an evap leak and a cam timing solenoid but nothing for the ESP or ABS. Any ideas where to look next?

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire