I completely agree, when I did the cv joint, I fitted it with back with no gap and the abs & traction control lights stayed out until I ventured above 30mph and then both came back on. Today I reduced the gap to 0.04mm, took it for a test drive and both lights stayed on. 4/100 of a millimetre (1.57 thou) isn't much of a gap. Obviously I don't know what the self setting distance is - it was an optimistic attempt to try and mimic the self setting gap in the event that the sensors were not being self set. Maybe now it has a new reluctor on one wheel and the original one on the other, the new & old reluctors are generating different strength signals ? I did check the nearside reluctor just to check that that one hadn't cracked as well. Can only be one of three things left :- faulty sensor/abs ecu/ wheel bearing. Trial and error without proper diagnostics. Maybe the Britpart CV joint hasn't got 60 teeth.