2007 Mercury Mountaineer power train problems
25 owner complaints filed with NHTSA name the power train on the 2007 Mercury Mountaineer — 31% of all complaints for this model year.
What owners report
“The contact owns a 2007 Mercury Mountaineer. The contact stated that after shifting the transmission from park(P) to reverse(R), the vehicle failed to respond. The contact removed and reinserted the fob key in the ignition to correct the failure. The vehicle was taken to an independent mechanic…”
filed Jun 18, 2025
“Had to replace transmission completely at 137,000 miles. There's been a lot of complaints about these transmissions at this mileage and ford should be responsible for some of the cost. This is ridiculous.”
filed Apr 12, 2021
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
When performing any transmission fluid changes or topoffs involving MERCON SP, MERCON LV has replaced all versions of MERCON SP and can be used going forward. Mixing MERCON LV and MERCON SP in the same transmission is…
SSM 51909 · Service Bulletin/Repair Instructions · issued Sep 7, 2023Ford: some vehicles may exhibit oil separation from the internal lube found in the unitized cartridge seal. Oil separation appears to be and is often misdiagnosed, as an axle lube leak. *pe
TSB-08-19-3 · Service Bulletin/Repair Instructions · issued May 1, 2009
Power Train problems in other Mountaineer years
| Year | Reports | Share |
|---|---|---|
| 2008 Mountaineer | 9 | 9% |
| 2006 Mountaineer | 39 | 33% |
| 2005 Mountaineer | 19 | 23% |
| 2004 Mountaineer | 64 | 30% |
| 2003 Mountaineer | 42 | 28% |
| 2002 Mountaineer | 144 | 39% |
| 2001 Mountaineer | 1 | 5% |
| 2000 Mountaineer | 15 | 12% |
| 1999 Mountaineer | 8 | 5% |
| 1998 Mountaineer | 9 | 4% |
| 1997 Mountaineer | 8 | 2% |
Other reported problem areas on the 2007 Mercury Mountaineer
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.