AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 1998 Pontiac Bonneville
Overall rating NHTSA-grounded
Poor
Estimated 5-year repair + maintenance cost: $5,000–$12,000
The 1998 Pontiac Bonneville has significant reliability issues related to the engine and fuel system, with frequent complaints and a significant recall. These issues contribute to high repair costs over time.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| Engine and cooling | 80,000–120,000 miles | $1,500–$2,500 | very common |
| Fuel pressure regulator | 70,000–100,000 miles | $200–$600 | common |
| Electrical system | 60,000–90,000 miles | $100–$500 | common |
| Transmission | 100,000–150,000 miles | $1,800–$3,500 | occasional |
| Brake pads and rotors | 50,000–70,000 miles | $300–$600 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter changes every 5,000 miles
- Brake fluid replacement every 2 years
- Transmission fluid flush every 30,000 miles
- Coolant replacement every 5 years
- Fuel system cleaning every 30,000 miles
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Engine misfiring or rough idle
- Strong gasoline smell from engine bay
- Frequent stalling or hesitation
- Unusual electrical issues
- Loss of acceleration or power
Generated by gpt-4o on 8/24/2026. Cost ranges are conservative estimates that account for typical regional variation.