Various problems with the 5-speed automatic transmission were common. These problems can be more common on the 2002 models with build dates before March, 2002. There are many service bulletins describing the diagnoses and repairs, which include fluid leak repairs, transmission software updates, or internal failures requiring a costly repair.
Problems With Early Production 5-speed Automatic Transmission on Mercury Mountaineer
Average mileage: 124,059 (70,000–170,000)
Drive Trains affected: 2WD, 4WD
23 people reported this problem
had to get the transmission rebuilt because the O/D light came up and the transmission started skipping and didn't allow you to go fast. it cost $1000 to get it fix.
2008 Mercury Mountaineer - 4WD 87,000 mi, Visitor
Transmission failed requiring total rebuild.
2003 Mercury Mountaineer - 4WD 170,000 mi, Visitor
Mine is actually the AWD model. We performed that fix here: http://www.fordservoboretransmissionfixsolution.com The transmission has successfully managed another 30,000 miles but now it's done. P0745 and P0775. O/D light blinks and the truck slips in between 2/3rd. I didn't know it years ago, but apparently part of my bad gas mileage had to do with the fact that I'd lost 5th gear a long while ago.
2002 Mercury Mountaineer - 4WD 124,674 mi, Visitor
Tranny won't pull in any gear j servants to sit and rev up
2004 Mercury Mountaineer 128,000 mi, Visitor
Transmission started slipping the RPMs raises higher than the truck is going then eventually it will catch up
2002 Mercury Mountaineer - 4WD 70,000 mi, Visitor
Transmission started down-shifting at speed. New transmission and bore and servo work : $3400
2002 Mercury Mountaineer - 4WD 102,900 mi, Visitor
check transmissin message. Incorrect gear ratio 5th gear reliable tranny shop $2,100 mercury $3600. Light only came on once.might look for new car
OD off flahes in msg center, and check engine indicator comes on. Waldorf Ford recommends trans replacement @ $3700.00
1998 Mercury Mountaineer - 4WD 150,000 mi, Visitor
My Mountaineer is getting up at 3500 rpms to go 35 miles per hour
2003 Mercury Mountaineer - 4WD 94,000 mi, Visitor
Transmission gave out this morning with no warning really, lost reverse and couldn't drive over 30mph. I'm looking at a costly repair from transmission shop, not sure what yet but I'm kind of dissapointed that Ford wouldn't take responsibility for this issue seeing it's obviously manufactured issue, it's way to common to not be something that happened during the assembly of vehicles. That's a lot of money to come out of the average persons pocket and its not even I'm the 100,000 mile range, I'm so dissapointed and regret buying this.
2002 Mercury Mountaineer - 2WD 120,000 mi, Visitor
Had to replace servo bores in tranny along with major overhaul. $2600!
2004 Mercury Mountaineer - 2WD 130,000 mi, Visitor
Mi trasmision no da rebersa pero los demás cambios funcionan bien. El mecánico dise que son los selenoides camviaro el asiste y no se veían rebabas.pude ser eso o es megor cambiar toda la trasmisión
2002 Mercury Mountaineer - 4WD 110,000 mi, Visitor
would not change gears needed new transmission
2002 Mercury Mountaineer - 4WD 120,000 mi, Visitor
Per Transmission shop needs new transfer case & possibly may need entire transmission rebuilt. GREAT!