Right. My '99 BMW 520i manual 2l petrol E39 had the ABS light lighting up, accompanied by the ASC light and at the same time neither speedo, odo or econo worked. This happened out of the blue one time and the issue has not disappeared.
After some internet research I reckoned the most likely cause was a failing ABS wheel speed sensor on the rear left side of the car. I procured one of them on ebay which my local mechanic fitted today and he reckoned the old sensor was deffo faulty. The ABS etc. light is still on. I haven't driven the car or tested if the ABS works though.
Here's my question: should the warning light have turned off after the new sensor was fitted or does the warning light only go off after you hook it up to diagnostics and switch it off that way?