2010 Mercury Mariner problems & reliability
269 owner complaints filed with NHTSA for the 2010 Mercury Mariner, 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.
3 complaints report injuries (6 injured).
Federal crash records (FARS 2020–2023): 2010 Mercury Mariner vehicles were involved in 10 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 |
|---|---|---|
| Vehicle Speed Control → | 66 | 25% |
| Engine → | 61 | 23% |
| Power Train → | 60 | 22% |
| Steering → | 60 | 22% |
| Fuel/propulsion System → | 57 | 21% |
| Electrical System → | 29 | 11% |
| Unknown OR Other | 11 | 4% |
| Fuel System, Gasoline | 7 | 3% |
| Structure | 7 | 3% |
| Electronic Stability Control (esc) | 6 | 2% |
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 61,000 miles (middle 50% between 42,000 and 100,000 miles), based on 224 complaints that included mileage.
Complaints by incident year
What owners report
“The contact owns a 2010 Mercury Mariner. The contact stated that after starting the vehicle, the message "Power Steering Assist Failure" was displayed, and the steering wheel became extremely difficult to turn in either direction. The local dealer and manufacturer were notified of the failure, but no assistance was…”
Steering · filed Dec 23, 2025
“Me and my wife purchased a vehicle from a private seller to use for personal commute. A month later we started to notice more issue were occurring with the car then stated from the seller. I took it to an auto body shop to get it inspected and possibly serviced and upon that inspection the clerk stated that there was…”
Electrical System · filed Sep 8, 2025
“Power Steering assist fault went out with no warning. Now steering wheel is locking up while driving. Also when trying to gain speed the vehicle bogs out.”
Steering · filed May 12, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Loss of power steering while driving
Defect Petition DP15001 · opened Apr 1, 2015 · closed Jun 14, 2018
- Electronic Throttle Body Malfunction
Preliminary Evaluation PE13003 · opened Feb 21, 2013 · closed Feb 28, 2014
- Rear Liftgate Window Glass Breakage
Preliminary Evaluation PE11016 · opened Apr 27, 2011 · closed Aug 18, 2011
Technical service bulletins
34 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2010 Mercury Mariner. The 10 most recent:
These SKUs are Exhaust Manifolds with Catalytic Converters. The customer communication requested return of unsold inventory due to a loss of CARB certification. These SKUs can no longer be sold as they do not meet CARB…
DOR-M9J4S-07 · Service Bulletin/Repair Instructions · issued Jun 3, 2020
These SKUs are Exhaust Manifolds with Catalytic Converters. The customer communication requested return of unsold inventory due to a loss of CARB certification. These SKUs can no longer be sold as they do not meet CARB…
DOR-M3J3F-07 · Service Bulletin/Repair Instructions · issued Jun 3, 2020
Some 2010-2020 vehicles may exhibit distorted glass with a subtle orange peel pattern or streaking etched into the surface. This is caused by hydrofluoric acid which is used in some car wash solutions as a cleaning…
SSM 48130 · Service Bulletin/Repair Instructions · issued Aug 9, 2019
On vehicles equipped with an automatic transmission it is imperative that the converter pilot hub be greased with Motorcraft Multi-Purpose Grease Spray XL-5-A even if grease was not applied from the factory. Also verify…
SSM 47976 · Service Bulletin/Repair Instructions · issued May 10, 2019
Replacing the original equipment SYNC/Navigation system with either an aftermarket SYNC/Navigation kit or modifying original SYNC/Navigation parts to provide additional features is not recommended nor supported on any…
SSM 47201 · Service Bulletin/Repair Instructions · issued Mar 30, 2018
The Accessory (Wireless) Keyless Entry Keypad can only be used with vehicles that are factory built with Remote Keyless Entry (RKE). The master code for the Accessory (Wireless) Keyless Entry Keypad can be retrieved…
SSM 47009 · Service Bulletin/Repair Instructions · issued Jan 10, 2018
The Accessory (Wireless) Keyless Entry Keypad can only be used with vehicles that are factory built with Remote Keyless Entry (RKE). The master code for the Accessory (Wireless) Keyless Entry Keypad can be retrieved…
SSM 47009 · Service Bulletin/Repair Instructions · issued Jan 10, 2018
Replacing the original equipment sync/navigation system with either an aftermarket sync/navigation kit or modifying original sync/navigation parts to provide additional features is not recommended nor supported on any…
SSM 46332 · Service Bulletin/Repair Instructions · issued Jan 24, 2017
Some 2008-2017 ford/mercury/lincoln vehicles equipped with sync may generate a vhr that identifies a concern with the brakes and suspension category indicating service is required due to a brake system warning lamp…
SSM 46132 · Service Bulletin/Repair Instructions · issued Oct 17, 2016
Some 2008-2017 ford/mercury/lincoln vehicles equipped with sync may generate a vhr that identifies a concern with the brakes and suspension category indicating service is required due to a brake system warning lamp…
SSM 46132 · Service Bulletin/Repair Instructions · issued Oct 17, 2016
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 2010 Mercury Mariner 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 2010 Mercury Mariner?
- · 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 61,000 miles — budget accordingly if the car is approaching that mileage.