1999 Ford Expedition Repair Question
Topics covered: Sensor, Vacuum leak.
Mileage: 320,000 miles.
Mileage: 320,000 miles.
Asked on April 3, 2011
Check engine light
Have a 1999 ford expedition, code 171 & 174 have been read on my OBD 2 scanner. What do has to be checked or replaced to erase these codes?
Asked by Chester&CharlieAnswer
Replied on April 3, 2011
02 sensors are reading lean, but with that many miles the should be replaced. also check for vacuum leaks at the pcv rubber elbow its a known leaker.