AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2003 Infiniti G35
Overall rating NHTSA-grounded
Below average
Estimated 5-year repair + maintenance cost: $5,000–$9,000
The 2003 Infiniti G35 is plagued by significant issues, particularly in the electrical system and fuel system. Multiple recalls point to serious safety concerns, notably the fuel filler hose and circuit board of engine components. The frequent complaints about the electrical system further reflect on its overall lower reliability.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| electrical system | 70,000–100,000 miles | $300–$1,200 | very common |
| fuel system | 50,000–80,000 miles | $200–$900 | common |
| engine cooling | 80,000–110,000 miles | $350–$1,500 | common |
| brake lights switch | 60,000–90,000 miles | $100–$300 | occasional |
| visibility system | 60,000–90,000 miles | $200–$800 | common |
Scheduled maintenance to budget
Routine items every owner should plan for.
- oil and filter changes
- brake fluid replacement
- coolant flushing
- transmission fluid change
- spark plug replacement
- timing belt inspection
- tire rotations
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- frequent electrical failures
- fuel smell during refueling
- unusual engine noises
- flickering headlights
- decreased braking efficiency
Generated by gpt-4o on 8/20/2026. Cost ranges are conservative estimates that account for typical regional variation.