AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2018 Hyundai Sonata
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $6,000–$12,000
The 2018 Hyundai Sonata has a moderate number of complaints, mainly involving engine and electrical system issues. These problems, coupled with a recent recall regarding the trunk latch, suggest an average reliability. However, the absence of critical safety or widespread failures balances the rating.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| engine components | 50,000–80,000 miles | $800–$2,000 | common |
| electrical system | 40,000–70,000 miles | $300–$1,200 | common |
| powertrain | 60,000–90,000 miles | $1,000–$2,500 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- oil and filter change
- brake fluid replacement
- engine air filter change
- transmission fluid service
- coolant system maintenance
- spark plug replacement
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- engine knocking sounds
- frequent electrical issues
- delayed gear shifts
Generated by gpt-4o on 8/23/2026. Cost ranges are conservative estimates that account for typical regional variation.