There are 8 stored owner reports matching the engine leading-label group for the 2005 Mercury Mountaineer in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 8 of 8 matching reports.
Open the full vehicle complaint log (all categories)ON TWO OCCASIONS THE ENGINE CUT OUT WHILE DRIVING THE CAR, ALL THE ENGINE WARNING LIGHTS CAME ON. ONCE THE CAR WAS SAFELY OFF THE ROAD AND PLACED IN PARK IT WOULD START AND CONTINUE TO OPERATE. THE FORD DEALER SAID THAT THERE WAS NOT FAULT CODE IN THE COMPUTER, THEY COULD NOT DUPLICATE THE FAILURE AND COULD NOT FIND ANY FAULT IN THE ENGINE SYSTEM. FORD SERVICE REPRESENTATIVES SAID I SHOULD GO A DIFFERENT FORD DEALER AND SEE IF THEY COULD SOLVE THE PROBLEM. I FIND SIMILAR ENGINE FAILURES DOCUMENTED ON THE INTERNET FOR THIS GENERATION OF CAR. MORE CURRENT SIMILAR MODEL ARE NOT REPORTED TO HAVE THIS PROBLEM. THUS I ASSUME FORD FOUND AND FIXED THIS PROBLEM. I ASKED THEM TO TELL ME HOW THEY SOLVED THE PROBLEM, THEY SAID THAT WAS NOT POSSIBLE. SO, I HAVE AN OTHERWISE GOOD CAR WHICH I CAN DO USE NOR IN GOOD CONSCIENCE SELL TO SOMEONE ELSE. PLEASE HELP! *TR
TL* THE CONTACT OWNS A 2005 MERCURY MOUNTAINEER. WHILE DRIVING AT APPROXIMATELY 50 MPH, THE ENGINE STALLED WITHOUT WARNING. THE CONTACT WAS ABLE TO RESTART THE VEHICLE. THE FAILURE RECURRED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 126,000. THE VIN WAS NOT AVAILABLE. ...UPDATED 07/30/15 *BF
AS I WAS DRIVING THE VEHICLE JUST DIED; ALL THE WARNING LIGHTS CAME ON AND AS I WAS LOSING SPEED I PULLED OVER TO CURB THE BEST I COULD. RESTARTED CAR AND IT SEEMED TO RUN FINE BUT HAPPENED AGAIN 20 MINUTES LATER. THIS HAS ALSO HAPPENED 2 OTHER TIMES WITHIN THE LAST 10,000 MILES OF DRIVING. *TR
MY MOUNTAINEER STALLS WITHOUT WARNING WHILE GOING ABOUT 35 MPH BUT AFTER A FEW MINUTES CAN RESTART. IT HAS DONE THIS 4 TIMES OVER THE LAST 3 OR SO MONTHS. IN ADDITION TWICE IT WOULD NOT START (IT HAD BEEN ABOUT 30 MINUTES SINCE I DROVE IT) AND IT HAD TO BE JUMPED. I REPLACED THE BATTERY THINKING THAT WAS THE PROBLEM BUT IT PERSISTS. I BROUGHT IT TO A REGULAR GARAGE ONCE, WHO KEPT IT FOR A DAY AND FOUND NOTHING WRONG. I THEN BROUGHT IT TO A MERCURY DEALER WHO KEPT IT FOR 2 DAYS BUT FOUND NO CODES OR PROBLEMS. IT JUST STALLED AGAIN TWO NIGHTS AGO WHILE I WAS DRIVING 35 MPH WITHOUT AND RESTARTED A FEW MINUTES LATER. THE DEALER HAD IT FOR A DAY BUT AGAIN FOUND NO CODES OR PROBLEMS. SO FAR I JUST PUT IN A NEW BATTERY AND THEY CHANGED THE OIL AND FILTER. *TR
MY TRANSMISSION WENT ONLY AFTER 1 YEAR OF HAVING CAR, SPEND OFVER $3,000 FOR A NEW TRANSMISSION AND NOW THE TRANSMISSION IS GOING AGAIN. THIS IS UNACCEPTABLE. I DON'T EVEN DRIVE THAT MUCH.
WITHOUT WARNING OF ANY KIND THE ENGINE QUITS UNDER 35 MPH, SOMETIMES WITH CRUISE CONTROL ON. AFTER CAR ROLLS TO A STOP, IT CAN RESTART RIGHT AWAY. LOSS OF POWER STEERING AND BRAKES. DEALER SAYS NO CODES TO BACK UP COMPLAINT. THIS HAS AS HAPPENED AT LEAST 3X SPREAD OVER 35,000 ODOMETER MILES. *TR
TL* - THE CONTACT OWNS A 2005 MERCURY MOUNTAINEER. ON 11/20/06 THE CONTACT'S HEATER ON/OFF SWITCH WOULDN'T ALLOW HER TO TURN THE HEATER OFF. THE CONTACT HAD TO DRIVE WITH THE WINDOWS ROLLED DOWN. THE CONTACT ALSO ATTEMPTED TO TURN THE VEHICLE OFF AND RESTART AND THE FAILURE CONTINUED TO OCCUR. WHILE DRIVING ON 12/18/06 AT 35MPH THE ENGINE STALLED AND THE VEHICLE SHUT OFF. THE WARNING INDICATOR LIGHT READ CHECK ENGINE, LOW PRESSURE PRIOR TO THE FAILURE. THE FAILURE ALSO OCCURRED ON 1/19/07. EACH TIME THE FAILURE OCCURRED THE CONTACT WAS USING THE CRUISE CONTROL. THE VEHICLE HAS BEEN DIAGNOSED AND FOUND THE VEHICLE TO BE OPERATING NORMALLY. THE MECHANIC HAS ALSO DRIVEN THE VEHICLE TO DIAGNOSE IT SINCE THE LAST FAILURE AND HAS EXPERIENCED NO FAILURES. SHE WAS ADVISED THAT THE SERVICE MANAGER WOULD CONTACT HER RE: THE FAILURE AND AFTER THE INITIAL CONTACT, SHE HASN'T RECEIVED ANY CALLS FROM HIM. AFTER 15 TO 20 MINUTES, THE VEHICLE WILL RESTART. THE MOST RECENT INCIDENT ALMOST CAUSED A COLLISION WITH A HEAVY DUTY TRUCK. THE MECHANIC ALSO STATED TO HAVE THE VEHICLE TOWED IF THIS REOCCURS. THE CONTACT DOES NOT WANT TO DRIVE THE VEHICLE DUE TO THE SAFETY RISK INVOLVED. THE CURRENT AND FAILURE MILEAGE WAS 13,000. THE MECHANIC ALSO ASKED IF A LIGHT WAS PRESENT ON THE WINDSHIELD AT THE TIME OF THE FAILURE.
TL*THE CONTACT OWNS A 2005 MERCURY MOUNTAINEER. WHILE DRIVING 35 MPH, THE VEHICLE STALLED AND THE ENGINE SHUT OFF. THIS HAS OCCURRED THREE TIMES SINCE 2006. THE FAILURE IS MOST COMMON WHILE DRIVING DOWN AN INCLINE AND WHEN THE CRUISE CONTROL WAS ACTIVATED. THE CHECK ENGINE LIGHT WAS ILLUMINATED AND THE POWER STEERING DOES NOT OPERATE NORMALLY. THE VEHICLE RESTARTED AFTER TEN TO FIFTEEN MINUTES. THE FAILURES OCCURRED ON DECEMBER 18, 2006, JANUARY 19, 2007, AND DECEMBER 4, 2007. ON EACH DATE, THE DEALER DIAGNOSED THE FAILURE FOR THIRTY DAYS AND STATED THAT THEY WERE UNABLE TO DIAGNOSE THE CAUSE OF THE FAILURE. THE DEALER ADVISED HER TO DEACTIVATE THE CRUISE CONTROL AND MAKE SURE THERE IS ENOUGH FUEL IN THE TANK. THE MECHANIC STATED THAT IF THE FAILURE RECURRED, THE VEHICLE SHOULD BE TOWED TO THE DEALER BEFORE ATTEMPTING A RESTART. THE MANUFACTURER HAS NOT OFFERED ANY ASSISTANCE. THIS IS THE SECOND COMPLAINT FILED WITH NHTSA. THE FAILURE MILEAGE WAS 12,327 AND CURRENT MILEAGE WAS 27,000. UPDATED 01/24/08 *BF UPDATED 01/24/08 *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.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.