YearToAvoid

2005 Mercury Mountaineer Engine Problems

NHTSA has 22 owner complaints about engine problems in the 2005 Mercury Mountaineer, 27% of all 82 complaints for this model year. That is #2 highest engine complaint count among 6 Mountaineer model years. These complaints report 3 crashes and 1 injury. Median mileage at failure: 44,775 miles.

Engine complaints
22
27% of 82
Crashes reported
3
Fires reported
0
Injuries reported
1
Median mileage
44,775 mi
Related recalls
0

When 2005 Mercury Mountaineer engine complaints were filed

First complaint Oct 19, 2005, latest Aug 10, 2022.

2005 Mercury Mountaineer engine complaints: complaints filed per month2Oct 2005Jul 2007Jun 2008Dec 2010Oct 2014Jul 2015Dec 2016
22 complaints filed with NHTSA from Oct 2005 to Aug 2022; peak Jul 2015 (2).

Engine recalls for the 2005 Mercury Mountaineer

No safety recalls on record for this model year.

Engine complaints by Mountaineer model year

Raw complaint counts per model year; newer years have had less time to accumulate complaints.

  1. 200522 (27%)
  2. 200659 (50%)
  3. 200716 (20%)
  4. 200811 (11%)
  5. 20091 (17%)
  6. 20106 (46%)

Frequently asked questions

Does the 2005 Mercury Mountaineer have engine problems?
NHTSA has 22 owner complaints about the engine in the 2005 Mercury Mountaineer, 27% of all complaints for this model year, including 3 that report a crash. Median mileage at failure is 44,775 miles.
Which Mercury Mountaineer year has the most engine complaints?
The 2006 Mercury Mountaineer has the most engine complaints (59), compared with 22 for the 2005.
Is there a engine recall for the 2005 Mercury Mountaineer?
No NHTSA recall campaign for the 2005 Mercury Mountaineer is classified under engine. Complaints alone do not trigger a recall; check the full recall list and your VIN.

Sources: NHTSA Office of Defects Investigation complaint and recall databases; U.S. EPA fuel economy data; NHTSA 5-Star Safety Ratings. Complaints are unverified owner reports.

Data updated Sep 24, 2026. Read the methodology and data sources. The Complaint Index is based on NHTSA owner complaints and recalls; it is not a reliability rating.