Have acquired an ATE sensor from eurocar parts instead of the cheap eBay sensor I tried! Fingers crossed it was just the cheap sensor being duff as well...Perfect! Cheers. Have bought an ATE branded one to replace it. See if that makes a difference instead of the cheap eBay one I acquired! Will serve me right for being cheap if it is just a crap sensor!Interested as well if you ever worked out what this was? Have the same thing on my drivers side front sensor. Diagnostic machine shows it as faulty, zero live data from it. Thinking it could be the wiring harness.
Yes - all it was, was the replacement sensors. Replaced them again with Delphi parts and they have been perfect since!
Best of luck. I like I say - never had the slightest problem since replacing the cheapo sensors.