ESP_a077 — Re RWSS Direction Fault
Full alert identifier: ESP_a077_ReRWSSDirectionFault
Message shown in the car
ABS (anti-lock braking system) disabled Drive with caution
Alert description
Plausibility fault while monitoring of wheel direction. Check mounting position of front left wheel speed sensor
Potential impact
Will disable VDC/TC and degrade ABS
Set condition
At least one wheelspeed sensor is mounted in the wrong direction. This error will be set if case one: 1 rotation direction of the sensor signal is in one direction and the other 3 rotations are in the other direction OR case two: 1 rotation direction of the sensor signal has no rotation and 1 rotation in one direction and 2 rotations in other direction.
Clear condition
Replace WSS and check proper mounting. All wheel speed sensors show the same rotation for 20 seconds.
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of ESP_a077.