802831 är ett fel som lagrats i din BMW:s minne (en ISTA-felkod, inte en standard OBD-II P-kod).
Vad det betyder: Trailer socket microswitch fault: the switch isn't closing properly, reports an implausible signal, or has an open line. Causes: dirt/corrosion/moisture in the socket, a stuck or broken spring-loaded plunger, broken/corroded wiring. Fix: clean the socket with contact cleaner, plug/unplug a trailer connector a few times, inspect wiring; replace the socket assembly if damaged.
