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OK tested the sensors earlier on today and three had a resistance of about 1K ohm which I think is about right and one was open circuit. So now I know one is no good so I’ll replace it, but the 2-0 fault registered indicated an internal ECU issue. The question is whether or not the ECU is...

I can understand that if I hadn't tried this second ECU and cleared the codes prior to driving. Is there any way of testing ECU's to find out what the fault is? I just don't want to get another one and have the same thing happen if there's a problem elsewhere which is buggering a good ECU.

Someone please help! Disco 1 300TDI XS ABS light was on so I whipped out all the sensors cleaned them up and popped them back in. All seemed OK as expected with no light, I was in a happy place. Recently (just before MOT) light came back on so I checked sensors and all OK, did the usual fault...