Lexus RX350 vs Mercury Mountaineer

Both cars' complete complaint records, side by side.

Read the totals carefully. NHTSA publishes no sales figures, so the car that sold more collects more complaints regardless of quality. The rows worth weighing are the proportions — the share of complaints that involved harm, and which part dominates.

Measure	Lexus RX350	Mercury Mountaineer
Complaints on file	1,065	2,646
Model years covered	2007–2023	1996–2010
Worst model year	2010	1997
Best model year	2019	2010
Crashes reported	203	191
Fires reported	31	91
Injuries reported	85	148
Deaths reported	3	5
Most complained-about part	Engine & Cooling	Transmission & Drivetrain
Share of complaints involving harm	30.2%	16.4%

Lexus RX350 by year

210 160 114 123 49 46 39 22 58 78 69 30 41 9 2 11 4

07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Complaints filed with NHTSA, by model year. Bar colour is the FaultScore grade: A B C D F ungraded

What breaks

Engine & Cooling 137 12.9%

Acceleration & Cruise Control 128 12.0%

Other & Unspecified 100 9.4%

Body & Structure 96 9.0%

Steering 84 7.9%

Airbags 82 7.7%

Brakes 82 7.7%

Electrical System 76 7.1%

Mercury Mountaineer by year

3 399 298 182 164 32 504 220 271 113 153 119 156 8 24

96 97 98 99 00 01 02 03 04 05 06 07 08 09 10

Complaints filed with NHTSA, by model year. Bar colour is the FaultScore grade: A B C D F ungraded

What breaks

Transmission & Drivetrain 399 15.1%

Tires 364 13.8%

Body & Structure 298 11.3%

Acceleration & Cruise Control 221 8.4%

Engine & Cooling 217 8.2%

Electrical System 190 7.2%

Brakes 142 5.4%

Seats 127 4.8%