Hi Datatek,I fitted after market sensors to both mine with no problems .Make sure they are pushed fully home until they touch the reluctor ring.
Yes they are fully home. I cleaned all the loose rust off the hubs and reluctor rings as well when I had them off the vehicle, so I don't think the sensors have picked up any fragments of rust. I think I might just disconnect the battery for a while and reset the system and then see what happens.