Morning Alan
Welcome to the Forum
If my old brain is functioning your car has a combined ABS/ASC unit and from memory again I didn't think there were alternatives (but I am old) Just had a quick look at ISTA and my old brain is working😅 There was only one part number for your model 34511090911 if you have the correct part number the only thought I have is that as the Unit is combined ABS/ASC one of the valves is sticky so you get the intermittent fault. Do you still have the original ? try swapping the electrical (brain) part or send it off to someone like ECU Testing who specialise in repairing these units
Good luck Hope this helps
Dave
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Greydog ·