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ABS diagnostic fault on my Volkswagen Golf GT - what could be causing it?

My car is a Golf GT Sport TDI and it is three and a half years old. The ABS light came on and I took it to my garage which did the diagnostics tests. £170 later I was told it was the ABS controller unit. Today I have been to Volkswagen to ask about it and they said they will look into it. Is this a common fault and what do you suggest?

Asked on 30 June 2012 by JP, via email

Answered by Honest John
It's probably the brake pressure sensor in the ESP part of the module. A repair costs £225 by www.sinspeed.co.uk plus the cost of removing and refitting the module. If I’m correct, you did not need to pay £170 to find that out and should demand the money back.
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