OK. I have checked all pins in ecu and relay connections on ABS unit. OVP is still fine. Took the car for a spin and tried several emergency stops. ABS is working but ABS light is still on.
I checked the front sensors with an ohmeter and the left one is reading 987 ohms and the right one is 976 ohms. It is getting dark so didnt check rear sensor. I presume they were the sensors........the connections looked like large tv aerial connectors....one either side of the car mounted by plastic clips!
I checked battery is charging and got a reading of 14.05 volts
Any ideas what else it could be?