One problem related to engine exhaust system has been reported for the 2004 Mercury Mountaineer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mercury Mountaineer based on all problems reported for the 2004 Mountaineer.
Dt:the consumer stated during braking the vehicle stalls. When the cvonsumer went to restart and put it in drive it stalled again. Took vehicle to the service department 3 times. The second time they replaced the fuel pump, the first time they updated the engine controller software. For the 4th time total loss of vehicle power when braking from 55 mph. Dealer replaced maf sensor. Driver rear door molding catching front door molding at times when opening.