AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2003 Infiniti M45
Overall rating NHTSA-grounded
Below average
Estimated 5-year repair + maintenance cost: $7,000–$12,000
The 2003 Infiniti M45 has a high incidence of fuel system and engine-related issues, reflected in numerous recalls and owner complaints. This impacts its reliability and increases ownership costs, resulting in a below-average rating.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| fuel gauge | 80,000–110,000 miles | $250–$500 | very common |
| cam/crank position sensor | 60,000–100,000 miles | $200–$400 | common |
| electrical components | 70,000–100,000 miles | $150–$300 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter changes
- Brake fluid replacement
- Transmission fluid change
- Coolant flush
- Timing belt inspection
- Spark plug replacement
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Erratic fuel gauge readings
- Engine stalling or hesitation
- Dashboard warning lights
- Unexplained fuel consumption
- Inconsistent engine power
Generated by gpt-4o on 8/20/2026. Cost ranges are conservative estimates that account for typical regional variation.