AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2003 Infiniti I35
Overall rating NHTSA-grounded
Below average
Estimated 5-year repair + maintenance cost: $6,000–$12,000
The 2003 Infiniti I35's rating is impacted by significant airbag and engine issues. Frequent engine complaints and extensive airbag recalls outline potential reliability concerns.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| engine | 80,000–120,000 miles | $500–$2,500 | very common |
| airbag system | any mileage | $0–$1,500 | common |
| cam position sensor | 70,000–100,000 miles | $150–$350 | common |
| electrical system | 90,000–130,000 miles | $300–$1,000 | occasional |
| vehicle speed control | 100,000–130,000 miles | $200–$800 | 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 3 years
- Transmission fluid change every 60,000 miles
- Timing belt replacement at 100,000 miles
- Inspect tires and rotate every 7,500 miles
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Check engine light persistence
- Airbag warning light activation
- Stalling or rough idling
- Irregular speedometer behavior
- Unusual engine noises
Generated by gpt-4o on 8/20/2026. Cost ranges are conservative estimates that account for typical regional variation.