2006 Mercury Mountaineer: Reliability Data

Source: NHTSA — 153 complaints
153
Total Complaints
58,945mi
Median Mileage
POWER TRAIN:AUTOMATIC TRANSMISSION
Top Issue
9
Crash Reports

When Do Complaints Happen?

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

42,000 25th Percentile
58,945 Median Mileage
87,664 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

POWER TRAIN:AUTOMATIC TRANSMISSION
23
ENGINE AND ENGINE COOLING:COOLING SYSTEM
19
ENGINE AND ENGINE COOLING
17
POWER TRAIN
14
ENGINE
14
UNKNOWN OR OTHER
9
ELECTRICAL SYSTEM
7
SEATS
6
STRUCTURE:BODY
5
ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY
5

Severity Assessment

9
Crashes
5
Fires
8
Injuries
0
Deaths

Sample Complaint Reports

"THE VEHICLE STALLS IN DRIVE WITHOUT WARNING. THE DEALERSHIP HAS BEEN UNABLE TO DETERMINE AND FIX THE PROBLEM."
"THE TRANSMISSION IN MY 2006 MERCURY MOUNTAINEER HAS "POPPED" INTO REVERSE TWICE ONCE IT WAS PLACED INTO PARK, CAUSING IT TO ROLL BACKWARDS. IT ALSO ROLLS FORWARD AND BACKWARDS WHEN PLACED IN PARK UNTIL IT "CATCHES" AND FINALLY LOCKS IN PLACE. WHEN CLIMBING HILLS OR STEEP GRADES, THE TRANSMISSION W..."
"TL*THE CONTACT OWNS A 2006 MERCURY MOUNTAINEER. ON A SNOWY DAY AFTER DRIVING THE VEHICLE THE DRIVER NOTICED THAT THE BACK REAR DOOR WINDOW WAS BROKEN. THE CONTACT STATED THAT THERE WAS NO PREVIOUS CRACKS OR EVIDENCE OF CRAKS IN THE WINDOW. THE LOCAL DEALER INFORMED HER THAT SHE WAS RESPONSIBLE ..."

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