My saff has been for its first mot since restoring it. It failed on the ABS light, which is constantly on. I have tried a different ABS ecu but this made no difference. The light never goes out.

It also failed on horn not working and washer jets not working, both because i forgot to connect them up

Does anyone know how to diagnose the abs lights???

Also, i got him to check the C0 level and it was 0.14 % at idle. Now he said this was dangerously low. We tried to turn the adjustment screw on the ecu (standard L6) but it made no difference. I gave it 2-3 full turns and nothing changed. The funnny this is, I took the engine out of another car, and the MOT certificate for that one stated exactly the same C0 %. Could this be a knackered ecu?? ( i have removed the cover and the adjustment screw is turning the resistor thingy.