2004 Mercury Mountaineer problems & reliability
210 owner complaints filed with NHTSA for the 2004 Mercury Mountaineer. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
15 complaints report injuries (16 injured).
Federal crash records (FARS 2020–2023): 2004 Mercury Mountaineer vehicles were involved in 16 fatal crashes with 13 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Structure | 79 | 38% |
| Power Train | 64 | 30% |
| Vehicle Speed Control | 21 | 10% |
| Electrical System | 16 | 8% |
| Air Bags | 12 | 6% |
| Engine and Engine Cooling | 11 | 5% |
| Unknown OR Other | 9 | 4% |
| Engine | 8 | 4% |
| Suspension | 6 | 3% |
| Visibility | 6 | 3% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 69,459 miles (middle 50% between 44,925 and 95,049 miles), based on 176 complaints that included mileage.
Complaints by incident year
What owners report
“This vehicle is has a power train problem from day one with the 5R55S/W transmission and AWD transfer case. I purchased this vehicle where it stranded my family over 200 miles from home and it's a non running car. This vehicle should have been removed from being sold with this defect and crushed! I will never buy a…”
Power Train · filed Jun 21, 2021
“Takata recall air bag light stays on for no apparent reason... All the time grinding noises while turning left or right sounds like gears are freely spinning while engaged and driving. No issues with changing gears as far as mechanic says.”
Air Bags · filed Jan 6, 2019
“Operating the tailgate window hinges broke off screws appeared to have severe corrosion vehicle was stationary”
Structure · filed Sep 7, 2018
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Vehicle Rollaway Allegations
Engineering Analysis EA09013 · opened Aug 18, 2009 · closed Feb 12, 2013
- REAR LIFTGATE GLASS HATCH FAILURE
Recall Query RQ08003 · opened Jun 23, 2008 · closed Oct 24, 2008
- SPARK PLUG EJECTION FROM CYLINDER HEAD
Defect Petition DP05005 · opened Sep 22, 2005 · closed Jan 4, 2006
Technical service bulletins
103 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2004 Mercury Mountaineer. The 10 most recent:
Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel…
TSB 19-2026 · Service Bulletin/Repair Instructions · issued Feb 7, 2019
Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel…
TSB 19-2026 · Service Bulletin/Repair Instructions · issued Feb 7, 2019
The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic throttle bodies (ETBs). The ETC_ACT and ETC_DSD PIDs should not used to diagnose possible ETB concerns. The IDS has a…
SSM 46085 · Service Bulletin/Repair Instructions · issued Sep 21, 2016
Ford/lincoln/mercury: if battery was disconnected or dead, vehicles/trucks may experience hard starts and engine idle rpm fluctuation and exhibit diagnostic trouble codes (dtcs) p0505, p0506, p2111 and p2112. *pe
TSB-12-7-4 · Service Bulletin/Repair Instructions · issued Jul 10, 2012
Ford: 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
Some 1997-2008 vehicles equipped with a 4.6l 2v, 5.4l 2v, or 6.8l 2v engine--spark plug thread repair procedure--not covered under new vehicle limited warranty. *nj this includes f-53 motorhome chassis. Updated 2/23/10…
07212 · Service Bulletin/Repair Instructions · issued Oct 1, 2007
Low tire indicator on - tpms system sensor wake up. *tt
0637 · Service Bulletin/Repair Instructions · issued Jan 1, 2006
Malfunction indicator lamp on with pcm diagnostic trouble code p0463 and/or ic diagnostic trouble code b1201 - fuel gauge drops to empty or slow to update after refueling. *tt
05213 · Service Bulletin/Repair Instructions · issued Jan 1, 2006
Limited slip axle chatter, shudder, binding sensation, or vibration during low speed turning maneuvers. *tt
06216 · Service Bulletin/Repair Instructions · issued Jan 1, 2006
Wds cop kit diagnostic tip - coil on plug (cop) ignition systems - engine misfire or rough running. *tt
041601 · Service Bulletin/Repair Instructions · issued Nov 14, 2005
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
No NHTSA recall campaigns name the 2004 Mercury Mountaineer in our current data. Recalls may apply only to certain VIN ranges — always confirm with a VIN check.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2004 Mercury Mountaineer?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 69,459 miles — budget accordingly if the car is approaching that mileage.