AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2009 Mercury Mariner
Overall rating NHTSA-grounded
Below average
Estimated 5-year repair + maintenance cost: $5,000–$9,000
The 2009 Mercury Mariner faces frequent steering issues due to electric power assist failures, alongside engine and transmission problems, contributing to its below-average rating.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| steering system | 60,000–90,000 miles | $900–$1,400 | very common |
| engine components | 80,000–110,000 miles | $1,500–$3,500 | common |
| transmission | 90,000–120,000 miles | $1,800–$3,000 | common |
| electrical system | 70,000–100,000 miles | $300–$800 | occasional |
| wheel bearings | 50,000–80,000 miles | $250–$500 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change every 5,000 miles
- Brake fluid replacement every 2 years
- Transmission fluid change every 60,000 miles
- Inspect suspension components annually
- Replace air filter every 30,000 miles
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Steering becomes stiff
- Check engine light stays on
- Unusual transmission noises
- Electrical components not working
- Wheel bearing noises
Generated by gpt-4o on 8/23/2026. Cost ranges are conservative estimates that account for typical regional variation.