Originally Posted by sedanbob
I missed that you mentioned adding the wire. It seems to me that the wire you added should function just fine to ground the base of the sensor. Generally, if a sensor already has thread sealant on it, it should be of a type that will not interfere with grounding the sensor. Liquid Teflon thread sealant (not the tape) should work. The tape can interfere with the sensor grounding.
So any suggestions where to look next?