You may want to only tape the first couple threads. You probably taped them too well and you aren't getting ground through the sensor.
First from what direction? Even with a **** ton of tephlon tape, it still tightened down all of the threads.
2000 Pontiac Trans Am WS6 M6: 427ci LS3, Built T56, Moser 9" w/ 4.11 Gearing, Full Suspension, and 6-point Cage. 2000 Pontiac Grand Prix GTP: Twincharged (T67 Turbocharger). 2007 Chevrolet Silverado 3500 Dually: Intake, Exhaust, and Tune.