I also have cleaned off the the brass tabs at the end of the sensor almost every year since i've owned my 91 notch since it was bran new . 
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1991 5.0 NotchBack,Black
as of 05/04/09 34,300mi.
2001 LIGHTNING Black 29,872 mi.
05/04/09
(Hangar Queen)
SMOKEM UP
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