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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
according to my list b1b7d is a weight sensor thing, like the one that tells the airbag whether to be on or off. that said, I wouldnt be surprised if it has this meaning too. as far as the U code, i would imagine behind the dash. but not always seen it elsewhere too. take this as a bump for your thread.