AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2003 Cadillac Sts
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $7,000–$10,000
The 2003 Cadillac STS has a moderate level of reliability, with no severe recalls reported and minor complaints mostly about the engine and electrical systems. It has average repair costs over five years.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| engine cooling | 80,000–110,000 miles | $500–$800 | common |
| electrical system | 60,000–100,000 miles | $200–$400 | occasional |
| service brakes | 70,000–120,000 miles | $300–$600 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change
- Brake fluid replacement
- Spark plug replacement
- Transmission fluid change
- Coolant system flush
- Air filter replacement
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Overheating engine
- Flickering dashboard lights
- Brake pedal softness
- Unusual engine noises
- Difficulty starting
Generated by gpt-4o on 8/24/2026. Cost ranges are conservative estimates that account for typical regional variation.