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Back Pressure Sensor
I own a 04 Excursion and have had the sensor changed out four times now. First two by dealership. After second one went out, I straight piped from manifold doing away with CAT and muffler. Changed the sensor out two more times and still no luck. Now the dealership is telling me its because of the straight pipe and this sensor needs back pressure to operate. How can this be, with all the after market cat and muffler delete options there are. Would a programmer fix this problem?
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