Two problems related to gas recirculation valve (egr valve) have been reported for the 1998 Mercury Mountaineer. The most recently reported issues are listed below.
The contact owns a 1998 Mercury Mountaineer. The contact stated that there is a crack in the center of the egr valve. The vehicle is making an unfamiliar noise and gas fumes are entering the vehicle. There were no warning indicators. The vehicle has not been diagnosed. The purchase date, engine size, and a valid VIN were unknown. The current mileage is 72,000 and failure mileage was 69,000.
1998 Mercury Mountaineer transmission repairs. There was no third gear and the transmission had to be replaced. Engine light stayed on and the egr sensor had to be replaced.