There are 6 owner-reported suspension complaints for the 2004 Mercury Mountaineerin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
HUMMING IN FRONT AT ALL SPEEDS FT WHEEL BEARINGS WHERE BAD. NOW RIGHT REAR BEARING MAKING NOISE. VERY LOOSE . LOTS OF OTHER COMPLAINTS ONLINE NEED TO BE LOOKED AT
TL* THE CONTACT OWNS A 2004 MERCURY MOUNTAINEER. THE CONTACT STATED THAT WHILE TRAVELING 50 MPH, THERE WAS AN ABNORMAL NOISE AND BURNING ODOR EMITTED FROM THE REAR END OF THE VEHICLE. THE VEHICLE WAS RESTARTED BUT THE FAILURE RECURRED. THE FAILURE OCCURRED ON TWO OTHER OCCASIONS. THE VEHICLE WAS TAKEN TO A PRIVATE MECHANIC WHERE IT WAS DIAGNOSED THAT THE REAR DIFFERENTIAL AND THE AXLES NEEDED TO BE REPLACED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 131,530 AND THE CURRENT MILEAGE WAS 131,619.
THIS WILL NOW BE THE 5TH TIME WE HAVE REPLACED A BALL BEARING IN THIS [XXX] TRUCK ... THE FRONT DRIVER TWICE THE FRONT PASSENGER ONCE AND NOW THIS IS THE SECOND TIME FOR THE BACK DRIVER! THIS IS HORRIBLE! THERE HAS TO BE MORE OF AN ISSUE THEN JUST THAT IF IT KEEPS HAPPENING! I WILL BE CONTACTING MERCURY AND I PRAY SOMETHING GETS DONE! THIS IS NOT A CHEAP FIX EITHER! AND WHEN IT HAPPENS IT IS LIKE THE TIRE IS ABOUT TO FALL OFF IT WOULD IF THERE WEREN'T LUG NUTS ON IT! BY FAR THE WORST SUV I HAVE HAD! 1000S OF DOLLARS TO FIX IT AND IT JUST KEEPS HAPPENING WHY AND WHY HASN'T THERE BEEN A RECALL ON THIS?? *TR
2004 MERCURY MOUNTAINEER WITH 40K MILES HAD DRIVER SIDE UPPER AND LOWER BALL JOINT FAILURE. THIS WAS UNCOVER DURING A NORMAL STATE INSPECTION. REPLACEMENT OF BOTH JOINTS WAS REQUIRED TO SAFELY DRIVE THIS CAR. *TR
I HAVE A USED 2004 MERCURY MOUNTAINEER I PURCHASED IN 12/2008 IT HAD 53,000 MILES. I HAVE DONE ALL OF THE REQUIRED MAINTENANCE OIL CHANGES,BRAKE PADS,FLUID CHANGES, AND 60,000-MILE SERVICE PACKAGE. I HAVE NOTHING BUT PROBLEMS WITH THE VEHICLE. THE FAILURES I HAVE ARE AS FOLLOWS: 1. FRONT/REAR BRAKE PADS,FRONT/REAR ROTORS,SPARK PLUGS,-DEFECTED PARTS 2. BATTERY 3. TIRES-CONSTANT FLATS 4. LUG TORQUE-DRIVER FRONT/REAR 5. HOOD SHOCKS,TIRE PRESSURE SENSOR LIGHT 6. TRANSMISSION FLUID LEAK/ FRONT PUMP SEAL LEAK 7. NOISE AT HARMONIC BALANCER 8. ROAR NOISE AND SHAKES AT ALL SPEEDS 9. HUB ASSEMBLIES MAKING NOISE FRONT LEFT/RIGHT SIDE; UNLESS REPLACED VEHICLE UNSAFE TO DRIVE PER FORD DEALERSHIP 10. BRAKE PADS- FRONT/REAR NEED TO BE REPLACED GOING BAD (SECOND TIME NEEDING TO BE REPLACED) 11. NEEDS FRONT ALIGNMENT-PULLS TO THE RIGHT SIDE 12. FUEL FILTER 13. NEEDS ALL NEW TIRES 14. IGNITION COIL -DEFECTIVE NEEDS TO BE REPLACED 15. VEHICLE GEAR SHIFTER IS STUCK WHILE DRIVING WON'T SHIFT AT ALL SOMETIMES STAYS STUCK AT CERTAIN SPEED WON'T MOVE 16.UNIVERSAL JOINTS 17. AXLE HOUSING GASKET REPAIRS AND CORRECTIONS DONE ON VEHICLE: 1.NEW BRAKE PADS ON FRONT/REAR,REPLACED SPARK PLUGS, RESURFACED FRONT/REAR ROTORS.- 8/2009 2.BATTERY REPLACED- 4/2010 3.TIRES-FLATS REPAIRED/PATCHED -8/2010,11/2010,2/2011 4.HAVE NOT REPAIRED/REPLACED 5.HAVE NOT REPAIRED/REPLACED 6.REPLACED SEAL, TRANSMISSION FILTER AND FLUID CHANGED,REPLACED SEAL-OIL-6/2011 7.HAVE NOT REPAIRED/REPLACED 8. VEHICLE IS SHAKING AND LOUD ROAR NOISE HASN'T BEEN FIXED-6/2011 9.HUB ASSEMBLIES FRONT LEFT/RIGHT SIDE REPLACED -6/2011 10.HAVE NOT REPLACED/REPAIRED 11.HAVE NOT REPLACED/REPAIRED 12.FUEL FILTER REPLACED-6/2011 13. BOUGHT BRAND NEW SET OF TIRES -6/2011 14.IGNITION COIL REPLACED-10/2009 15. HAVE NOT REPAIRED/REPLACED 16. HAVE NOT REPAIRED/REPLACED 17. AXLE HOUSING GASKET REPLACED-04/2011. *TR
2004 MERCURY MOUNTAINEER HAS HUB BEARING DEFECTS, TRANSMISSION DEFECTS, DRIVE TRAIN DEFECTS, REAR AXLE AND DIFFERENTIAL DEFECTS. THERE ARE THOUSANDS OF COMPLAINTS ABOUT THESE COMPONENTS OF MERCURY MOUNTAINEER AND FORD EXPLORER YET NHTSA DOES NOTHING. FORD WILL NOT FIX THESE PROBLEMS AND HAS BEEN DOING BAND AID FIXES UNDER WARRANTY. THEY DENY THERE IS A PROBLEM YET THERE ARE THOUSANDS OF COMPLAINTS ON THE VARIOUS WEB SITES. IT MAKES ME BELIEVE NHTSA IS IN BED WITH THE AUTO MANUFACTURERS AND REALLY DON'T CARE ABOUT THE PUBLIC. WHEELS FALL OFF CARS CAUSE HUB BEARINGS FAIL YET THERE IS NO RECALL.. FORD PUTS THE WRONG TRANSMISSION FLUID IN CARS, TRANSMISSION FAILS...THERE IS NO RECALL. REAR AXLE SEAL FAILS AND NO RECALLS WHY!!! *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026