1998 Mercury Mountaineer problems & reliability
236 owner complaints filed with NHTSA for the 1998 Mercury Mountaineer, alongside 2 safety recall campaigns. 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.
23 complaints report injuries (29 injured, 1 deaths reported).
Federal crash records (FARS 2020–2023): 1998 Mercury Mountaineer vehicles were involved in 11 fatal crashes with 8 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 |
|---|---|---|
| Tires | 95 | 40% |
| Vehicle Speed Control | 36 | 15% |
| Electrical System | 21 | 9% |
| Engine and Engine Cooling | 20 | 8% |
| Latches/locks/linkages | 12 | 5% |
| Seats | 12 | 5% |
| Structure | 11 | 5% |
| Suspension | 11 | 5% |
| Power Train | 9 | 4% |
| Visibility | 7 | 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 85,500 miles (middle 50% between 63,619 and 114,000 miles), based on 50 complaints that included mileage.
Complaints by incident year
What owners report
“At this point all 4 door locks/latches are messed up. Both driver &passenger back doors won't open from outside or inside. Driver &passenger front doors won't open from outside unless open from inside first. Key won't unlock doors. Back glass on hatch door won't open. Back wiper broken. Back hatch wouldn't open untill…”
Visibility/wiper · filed Jan 14, 2018
“Under my hood started smoking, I popped my hood to find flames under it. I had to get my kids out the truck and put the flames out with and extinguisher. That's when I noticed that my brake fluid reservoir was melted and so were the wires that connect to the cruise control switch. Not I am without a vehicle to get to…”
Vehicle Speed Control · filed Nov 19, 2017
“One of the braided stainless steel fuel lines that attaches to the engines fuel rail developed a leak. I kept smelling a strong odor of gas, but I could not find out where it was coming from. After two weeks of smelling the gas, I took it to a garage and they showed me the gas squirting from the braided hose going to…”
Engine · filed Feb 1, 2015
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- SPARK PLUG EJECTION FROM CYLINDER HEAD
Defect Petition DP05005 · opened Sep 22, 2005 · closed Jan 4, 2006
- ENGINE COMPARTMENT FIRES
Engineering Analysis EA05005 · opened Mar 22, 2005 · closed Aug 2, 2006 · led to recall 08V025000
- FRONT SEAT BACK RECLINER ATTACHMENT
Preliminary Evaluation PE03020 · opened May 21, 2003 · closed Sep 5, 2003 · led to recall 03V281000
- WINDSHIELD WIPER MALFUNCTION
Preliminary Evaluation PE99049 · opened Jul 28, 1999 · closed Apr 24, 2000 · led to recall 00V072000
- STEERING KNUCKLE SEPARATIONS
Preliminary Evaluation PE99045 · opened Jul 6, 1999 · closed Oct 29, 1999
- VEHICLE HESITATION/STALLING
Investigation SQ99017 · opened Jun 9, 1999 · closed Feb 22, 2000
- FUEL LINE DAMAGE FROM JUMP STARTING
Recall Query RQ98020 · opened Nov 3, 1998 · closed Nov 15, 2000 · led to recall 98V060000
Technical service bulletins
282 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 1998 Mercury Mountaineer. The 10 most recent:
Front axle leaks fluid from vent tube - vehicles equipped with 4x4 or awd. *tt
030508 · Service Bulletin/Repair Instructions · issued Apr 1, 2005
General (pcm) power train control module programming procedures. *tt
042107 · Service Bulletin/Repair Instructions · issued Dec 13, 2004
General power train control module (pcm) programming procedures. *tt
04217 · Service Bulletin/Repair Instructions · issued Nov 1, 2004
Driveability-malfunction indicator lamp (mil) illuminated-diagnostic trouble codes (dtc's) p0420 and/or p0430. *mj
0475 · Service Bulletin/Repair Instructions · issued Jan 1, 2004
Low line pressure reading at wide open throttle (wot), slipping shifts and / or delayed engagements with possible diagnostic trouble codes p0732, p0733, p1762 set on vehicles built before 12/1/2001. *tt
02138 · Service Bulletin/Repair Instructions · issued Nov 10, 2003
Malfunction indicator lamp illuminated with diagnostic trouble codes (dtcs) p0442, p0455, p0456, p0457 or p1442 or a check fuel cap lamp illuminated with dtc p0457 for the evaporative emission system. *tt
03203 · Service Bulletin/Repair Instructions · issued Oct 13, 2003
Rattle/buzz sound from under the vehicle on 4.0l single overhead cam (sohc) engines. *tt
03199 · Service Bulletin/Repair Instructions · issued Sep 29, 2003
Remote keyless entry (rke) - service tips. *tt
03181 · Service Bulletin/Repair Instructions · issued Sep 15, 2003
New transmission cooler flusher - service tips. 2003 escort and super duty f series included. *tt
03148 · Service Bulletin/Repair Instructions · issued Jul 21, 2003
An uncommanded shift to 4x4 low. *tt
16935 · Service Bulletin/Repair Instructions · issued Jul 1, 2003
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
The 1998 Mercury Mountaineer has 2 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
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 1998 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 85,500 miles — budget accordingly if the car is approaching that mileage.