ABS fault HELP
 

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Hi, new to this but have been told you lads and lasses are very helpfull!!
I have a MKIV golf 99 which has an ABS fault, the light comes on and the warning comes up, plugged into laptop the info comes back as "intermittent fault with abs pump/ controller". Have put 3 different abs units on it with no success, keep giving same fault. changed both pump and controller as complete unit. computer says sensors are fine. Tearing my hair out now and two different garages have given up with it!!! Help