Seems like a classic case of broken wires in the cable from all the years of driving and cable being bent as you turn the wheel or go over bumps or potholes. The wire strands are broken in the cable but sometimes make a connection so you still get reading in measuring blocks.
Over the years I have learned that:
1. You can cut out the middle of cable and re replace it with flexible cable and have many more years of service from the same sensor. I use microphone cable I bought many years ago from Maplin.
2.On the rare occasion it can be sensor itself faulty but there is not much in sensor anyway, just a magnet and wire coil so likely just a dry solder joint between coil and connecting cable. And in my experience if I replace it with cheap sensor it only lasts a year or 2 max.
3. Sometimes the sensor and connecting cable may be fine but there is a dry solder joint inside ABS unit. Open it up, reflow the solder joints and it's fine again
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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