AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2005 Audi S4
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $4,500–$8,000
The 2005 Audi S4 shows average reliability with notable recalls related to airbag inflators and complaints primarily for exterior lighting. Limited complaints on other components suggest moderate issues but no widespread failures. The vehicle has reasonable repair and maintenance costs, though certain failures like engine cooling and electrical system need attention.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| exterior lighting | 60,000–90,000 miles | $200–$400 | very common |
| electrical system | 70,000–100,000 miles | $300–$600 | common |
| engine cooling | 80,000–120,000 miles | $500–$1,200 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter changes
- Timing belt replacement
- Brake fluid replacement
- Coolant system check
- Transmission fluid change
- Spark plug replacement
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Unusual exhaust smoke
- Dimming or failing lights
- Overheating engine
- Battery drainage issues
Generated by gpt-4o on 8/19/2026. Cost ranges are conservative estimates that account for typical regional variation.