Fault ABS Sensor Rear Left

[North2007]

Guys, this fault came up recently. Results in the ESP/ ABS warning lights and deactivated park brake. After changing the sensor, fault still there. Used VCDS to establish fault came up before wheels turned. Turned out a bad connection at the terminal ABS pump up front. Cleaned up the male pins, reconnected and fault gone.

[lordchris]

Thanks for posting.

I have a similar problem with front left. Have changed the sensor to no avail, I have a vcds log what would I be looking for for similar root cause ?

[North2007]

Did you check plug loom connecting to ABS pump?

[lordchris]

Not yet

Need to check :

Pins into sensor
Wiring to sensor
Plug loom - is this just the wiring?

Waiting for toddler to get to bed and hopefully I’ll get the car into the garage for a look! If it’s the cable moving it by hand should trigger the fault ?

[North2007]

If the fault comes up on start up before moving it’s the sensor, wiring or pump. If it’s triggers on rolling, it’s the ABS ring. Moving the loom may not trigger it.

[lordchris]

Sensor changed, fault back. Vcds showing faults with control module.

Confirmed by local mechanic. Came on this morning going over a speed bump.

Check pins?