Kev0607 was bang on, thank you Kev.
Hallmark Volvo certainly know what they are doing. no doubt about that, and they managed to squeeze my car in even though they were actually fully booked up and trying to clear all jobs by this evening, before closing for Easter weekend.
Their diagnostic scan revealed 2 ABS sensors to be faulty. Their prognosis was that the sensors get corroded in their mountings and 'swell up' which distorts them.
so both cleaned up, replaced and some 'anti-corrosion compound' applied to help hold off future corrosion.
I expect the other 2 ABS sensors will go the same way before long but at least i know what to expect and who to take it to to get them changed.
All previous fault codes were cleared so i now have a code-free motor. happy day. and happy easter everyone.
