B3A51: Active Aerodynamic Feature C Position Sensor 2 Circuit Low Voltage — what it means, the affected system and what to check before replacing parts.
Active Aerodynamic Feature C Position Sensor 2 Circuit Low Voltage. Source catalogue definition; confirm applicability using vehicle service information.
Affected system: Body
Also written as: B3A51-00, B3A5100 (some scan tools add the fault-type byte, e.g. -00).