"How reliable is the 2009 Mercury Mariner Hybrid?"

"Based on 30 NHTSA complaints, the 2009 Mercury Mariner Hybrid has a median complaint mileage of 100950 miles. The most common issue is STEERING."

"What are common problems with the 2009 Mercury Mariner Hybrid?"

"The most frequently reported component in NHTSA complaints for the 2009 Mercury Mariner Hybrid is STEERING, accounting for a significant portion of the 30 total complaints filed."

2009 Mercury Mariner Hybrid: Reliability Data

Source: NHTSA — 30 complaints

Total Complaints

100,950mi

Median Mileage

STEERING

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

68,250 25th Percentile

100,950 Median Mileage

128,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

STEERING

VEHICLE SPEED CONTROL

ENGINE

ELECTRICAL SYSTEM

FUEL/PROPULSION SYSTEM

SERVICE BRAKES

SERVICE BRAKES, ELECTRIC

SERVICE BRAKES, HYDRAULIC

ELECTRONIC STABILITY CONTROL (ESC)

POWER TRAIN

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"MERCURY MARINER HYBRID 2009 HAD IT FOR 18 MONTHS AND AUGUST 3, 2010 UPON AN APPROACH TO A STOP LIGHT ENGAGING THE BRAKES I HEARD AN AUDIBLE WARNING SOUND AND LOOKED AT MY CONSOLE TO SEE THE WARNING TO CHECK BRAKES, AT THAT MOMENT MY BRAKE PEDAL WENT SOFT AND TO THE FLOOR, I HAD TO APPLY THE EMERGENC..."

"TL*THE CONTACT OWNS A 2009 MERCURY MARINER HYBRID. THE CONTACT STATED THAT AFTER APPLYING THE BRAKES IN THE PARKING LOT THE VEHICLE ACCELERATED. THE VEHICLE DID NOT RESPOND TO THE BRAKES AND DID NOT STOP UNTIL THE VEHICLE CRASHED INTO A PARKED VEHICLE. AFTER HITTING THE VEHICLE THE RPMS CONTINUED T..."

"POWER STEERING CUT OUT, QUIT WORKING, ON LEFT TURN, SPEED ABOUT 10 MPH. OUTAGE LASTED ABOUT 1-2 SECONDS. BELIEVE WOULD HAVE HIT FAR SIDE CURB IF STEERING HAD NOT SPONTANEOUSLY RECOVERED. THIS WAS FIRST OCCURRENCE. DROVE CAR DIRECTLY TO DEALER FROM INCIDENT; DIAGNOSIS TBD. AFRAID TO DRIVE. AT..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28