Vauxhall Astra H estate - 20 1.3 Fault code U2108..... - Zero
>> I can't understand why the battery or alternator could cause the ABS warning light to
>> come on and give an ABS fault code.
The ABS control unit/pump on VX's of that era were notoriously voltage stability sensitive. An ABS light was often the precursor warning for failing battery/alternator