Intermittent ABS/ESP fault

[simmo]

Has anyone had any problems with an intermittent ESP/ABS fault?

VCDS has reported a front right sensor fault - so I've replaced the ABS sensor (with Bosch part number 0 265 007 928). The original sensor tested open circuit on a resistance test. Problem then seemed to be rectified, but then it came back a day or two later at random times. If the car is stood for a few days it can be fine, then reappear after 40 miles of driving. At other times it can reappear after 1/2 mile of driving

I think it could be a wiring loom fault (suspect the cable from the sensor plug into the ABS/ECU) possibly earthing or rubbing through somewhere. I'm also suspicious it could be a front bearing (wear) fault, thats throwing the sensor ring slightly out of alignment with the sensor - noticed the car is now clicking badly in carparks etc.

Has anyone had any issues like this - before I start to tear the car apart. (Before anyone asks local Audi franchise dealer was useless - they had the car three days, and had yet to test the wiring properly, so I took it back off them).

[douglas96]

It might be worth checking that the pins on the plug are not loose or corroded and that the pins look securely crimped onto the ends of the wires.

[douglas96]

It might be worth checking that the pins on the plug are not loose or corroded and that the pins look securely crimped onto the ends of the wires.

[simmo]

I'll whip the wheel off again and have another look at the connection near the wheel. Will also trace the loom back to the ESP/ABS box and put a test bulb/probe across it it to check if it can carry some current.

Had a look on the Bosch service repair website and looks like they can service/exchange the ABS/ESP 8.0 ECU for around the £300 mark...should it be that. The intermittent nature leads me to think its wiring or mechanical.