Problems · NHTSA complaints
2007 Mercury Mariner Hybrid problems
Owners filed 31 complaints about the 2007 Mercury Mariner Hybrid with NHTSA between Apr 2010 and Sep 2023. The most-cited component is service brakes (8).
Complaints
31
Filed with NHTSA
Crashes
1
Reported by owners
Fires
0
Reported by owners
Injuries
1
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Service brakes8
- Engine and engine cooling6
- Electrical system4
- Engine4
- Hybrid propulsion system3
- Power train3
- Structure2
- Steering2
- Fuel/propulsion system2
- Suspension1
- Traction control system1
- Equipment1
- Seats1
- Other / unknown2
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
5
3
5
3
4
5
3
2
0
0
0
0
0
1
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2010 | 5 |
| 2011 | 3 |
| 2012 | 5 |
| 2013 | 3 |
| 2014 | 4 |
| 2015 | 5 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 0 |
| 2021 | 0 |
| 2022 | 0 |
| 2023 | 1 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Service brakes
8 reports
“TL* THE CONTACT OWNS A 2007 MERCURY MARINER HYBRID. WHILE DRIVING APPROXIMATELY 60 MPH, THE BRAKE PEDAL TRAVELED TO THE FLOORBOARD BEFORE THE VEHICLE STOPPED. THE ANTI-LOCK BRAKE SYSTEM AND THE BRAKE INDICATORS ILLUMINATED. THE CONTACT STATED THAT THE FAILURE OCCURRED FIVE OTHER TIMES INTERMITTENTLY. ONCE THE VEHICLE WAS TURNED OFF AND RESTARTED, THE FAILURE WOULD STOP. THE VEHICLE WAS TAKEN TO THE DEALER (ED WHITTMEIER FORD IN CHICO, CALIFORNIA) FOR DIAGNOSTIC TESTING, BUT THE FAILURE COULD NOT BE DUPLICATED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE APPROXIMATE FAILURE MILEAGE WAS 84,000. *TT CONSUMER STATED BRAKES FAIL INTERMITTENTLY WHEN THEY FAIL THE ABS AND BRAKE LIGHT ON THE DASH ARE LIT UP. UPDATED 7/31/18*JB”
Engine and engine cooling
6 reports
“CAR ENGINE SUDDEN WENT DEAD IN THE MIDDLE OF HIGHWAY AND MESSAGE APPEARED THAT PULL OVER NOW FOR SAFETY. NO POWER TO WHEELS ECT. BARELY FOUND SAFE PLACE TO PULL OVER. DEALERSHIP SAID IT WAS CAUSED BY LEAKY WATER PUMP. VEHICLE WAS REPAIRED AT FOLSOM LAKE FORD. NO NOTE WAS ON THE DISPLAY SAYING WATER PUMP, JUST THE ABOVE MESSAGE. HAD TO WAIT AND RESTART ENGINE. THIS COULD HAVE CAUSED A SERIOUS ACCIDENT IN HIGH SPEED TRAFFIC ON A FREEWAY, ECT. *TR”
Electrical system
4 reports
“TL* THE CONTACT OWNS A 2007 MERCURY MARINER HYBRID. THE CONTACT STATED THAT THE ALARM SYSTEM SOUNDED INDEPENDENTLY. THE VEHICLE WAS NOT DIAGNOSED AND THE FAILURE RECURRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 70,000.”
Engine
4 reports
“TL* THE CONTACT OWNS A 2007 MERCURY MARINER HYBRID. WHILE DRIVING APPROXIMATELY 60 MPH, THE ENGINE STALLED AND THE INSTRUMENT PANEL DISPLAYED A TRIANGLE WITH AN EXCLAMATION POINT. THE PANEL DISPLAYED THAT THE DRIVER NEEDED TO PULL OVER IMMEDIATELY. THE CONTACT PULLED OVER AND THE IGNITION HAD TO BE TURNED TO THE OFF POSITION FOR A FEW MINUTES IN ORDER FOR THE VEHICLE TO RESTART. THE VEHICLE WAS TAKEN TO A DEALER WHERE IT WAS DIAGNOSED THAT THE MOTOR ELECTRONIC COOLANT PUMP FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND STATED THAT THE VEHICLE WAS NO LONGER INCLUDED IN NHTSA CAMPAIGN NUMBER: 14V526000 (ELECTRICAL SYSTEM). THE FAILURE MILEAGE WAS APPROXIMATELY 70,000.”
Hybrid propulsion system
3 reports
“The contact owns a 2007 Mercury Mariner. The contact stated while driving 50 MPH, the engine started to overheat, after which the vehicle lost motive power. The contact was able to pull to the shoulder of the roadway to let the engine cool down. After restarting the vehicle, the vehicle returned to normal functionality; however, the failure had since become a regular occurrence. The engine overheated warning light was illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 14V526000 (Hybrid Propulsion System) but the VIN was not included. The manufacturer was not notified of the failure. The failure mileage was 247,000.”
Power train
3 reports
“TL* THE CONTACT OWNS A 2007 MERCURY MARINER HYBRID. WHILE DRIVING APPROXIMATELY 65 MPH, THE VEHICLE STALLED AND THE CHECK FOUR BY FOUR, SERVICE BRAKES, AND PULL OVER SAFELY WARNING LIGHTS ILLUMINATED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE CONTACT MENTIONED THAT WHEN THE BRAKE PEDAL WAS DEPRESSED, THE VEHICLE JERKED FORWARD AND THE TRACTION CONTROL WARNING LIGHT ILLUMINATED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, BUT THE FAILURE WAS UNABLE TO BE DIAGNOSED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 65,000.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.