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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
I recently took my 1998 Ford Explorer Sport in to get inspected. I failed because they said my check engine light is out and my emission test failed. I looked at the sheet and it reported codes P0171 and P0174. About a year ago I had a new O2 sensor put in for what I think were the same codes...
