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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
Have a '97 Explorer XLT 4WD 4.0 engine, showing codes PO153 slow responce,
bank 2 sensor 1,PO401 EGR insufficient flow, and PO402 EGR excessive flow.
What has to be changed and in what order. Could some other part of EGR system be bad?