Did this tonight. Made no difference to the lights coming on. When I had the sensor out I had a look in and I can see a groove in the shaft that runs in the distribution block. That groove is not dead centre in the bottom of the hole where the sensor goes - that might be a cause.
I also tested the switch for continuity - the switch works OK, ie the circuit goes open/closed as expected. The only other thing is whether the end of the piston in the switch is worn.
I think what I need to do is bleed all the brakes out, then have another look at the distribution block and see if I can centre that shaft. Failing that its time to order a new sensor and rule that out.
Fran
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