AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2003 Infiniti Q45
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $8,000–$12,000
The 2003 Infiniti Q45 exhibits an average reliability with moderate issues in engine and electrical components. A notable recall affects side airbags, potentially impacting safety.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| engine | 80,000–120,000 miles | $1,500–$3,000 | common |
| electrical system | 70,000–110,000 miles | $500–$1,200 | occasional |
| steering | 90,000–130,000 miles | $400–$1,000 | 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
- Coolant flush every 60,000 miles
- Transmission fluid change every 60,000 miles
- Spark plug replacement every 105,000 miles
- Engine air filter replacement annually
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Unusual engine noises
- Electrical failures
- Steering wheel vibrations
Generated by gpt-4o on 8/20/2026. Cost ranges are conservative estimates that account for typical regional variation.