the abs light stayed on for ages so i took it to ford and paid £40 to get the light turned off. They said the rear right sensor was not picking anything up so i re fitted it and the light has not gone out. its a new sensor that fitted perfectly so i think thats is ok
You've not used too longer bolts with the addition of the spacer have you? I know a couple of cases where bolts sized for the 20mm spacers have been supplied with the 10/12mm spacer kits, which unless cut down to suit, foul the ABS ring.