You didn't mention the year/model. There is no shock sensor on regular PT's factory system. They only use hatch and door switches. Check your owner's manual.
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2004 Dark Plum Base with windows tinted, cabin filter, silencers removed, fog lights, 18\'s, all Red taillights, Blaine\'s struts, modesty cover, color-matched center dash, 06 rear bumper
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