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Tac5004 848 fault

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(@Take the stairs)
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I have a tac5004 that once a month gets a 848 fault it is always between 3rd and 4th floor. Ntsd vane flt. I have to reset the fault monitor. My ntsd & ntst is optical. Any help is appreciated .



   
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(@Whadafack)
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what i usually do is put electrical tape on the inner opening of the transducer to get a perfect 3/4 from the edge of the vanes. Make sure the vanes are center. Make sure the car is not shifting at those floors and do a tbs . Good luck



   
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