Last updated: 2026-08-24
KIA Optima vs Subaru Legacy: Reliability Compared
KIA Optima
Subaru Legacy
Choosing between the KIA Optima and the Subaru Legacy? This page compares their reliability scores, NHTSA recall history, owner-reported complaints, and estimated annual repair costs so you can make a confident long-term ownership decision between these two midsize sedans.
Our reliability scores are based on NHTSA recall and complaint data, independent repair cost estimates, and sales-normalized complaint rates. The Subaru Legacy currently leads with an average score of 75/100 compared to 71/100. Scroll down for the full year-by-year breakdown, common problem areas, and repair cost comparison.
How Do the KIA Optima and Subaru Legacy Generations Compare?
Verdict
The Subaru Legacy is more reliable than the KIA Optima, scoring 75/100 vs 71/100.
The Subaru Legacy demonstrates slightly superior reliability with an average score of 75/100 compared to the KIA Optima's 71/100. Despite having a higher number of recalls over a longer period, the Legacy has a lower complaint rate at 21.2 per 10,000 units, while the Optima records 23.3 complaints per 10,000 units. However, the Optima benefits from lower estimated annual repair costs at $471 versus the Legacy's $563. Both vehicles have common issues in the electrical system, but the Legacy's visibility problems and the Optima's engine concerns are notable differentiators.
Key Differences
- 1KIA Optima costs $92 less per year to repair
- 2KIA Optima has 16 fewer total recalls
- 3Subaru Legacy scores 4 points higher in reliability
Category Scoreboard
KIA Optima vs Subaru Legacy: Which Is More Reliable?
| Metric | KIA Optima | Subaru Legacy |
|---|---|---|
| Reliability Score | 71/100 | 75/100 |
| Years Tracked | 3 | 8 |
| Total Recalls | 3 | 19 |
| Complaints per 10k Sold | 23.3 | 21.2 |
| Annual Repair Cost | $471/yr | $563/yr |
| Repair Frequency | 0.2/yr | 0.3/yr |
| Major Repair Risk | 12% | 12% |
| Safety RatingNHTSA overall | 2020 NHTSA | 2025 NHTSA |
| Frontal | ||
| Side | ||
| Rollover | ||
| Year Wins | 2 (1 tied) | 0 (1 tied) |
What Are the Common Problems With the KIA Optima and Subaru Legacy?
The Subaru Legacy and KIA Optima exhibit distinct problem profiles, with notable differences in complaint distribution. The Legacy's primary issues are concentrated in visibility/wiper and electrical systems, with 139 and 97 complaints respectively, whereas the Optima's most significant problem area is the engine, accounting for 208 complaints, including 2 crash-linked incidents. While both models share concerns in the electrical system, the Optima faces more severe safety-related issues, particularly in air bags with 20 crash-linked complaints, compared to the Legacy's 1 crash-linked air bag complaint. Additionally, the Optima's service brakes also present a safety concern with 6 crash-linked complaints, highlighting a more acute safety profile compared to the Legacy.
| Component | KIA Optima | Subaru Legacy |
|---|---|---|
| ENGINE | 8.5Above Avg | 0.5Very Low |
| ELECTRICAL SYSTEM | 2.3Low | 4.5Average |
| VISIBILITY/WIPER | —None | 6.5Average |
| UNKNOWN OR OTHER | 2.6Low | 3.6Average |
| POWER TRAIN | 2.4Low | 0.4Very Low |
| AIR BAGS | 1.1Low | 0.4Very Low |
| SERVICE BRAKES | 1.1Low | 0.2Very Low |
| STEERING | 0.8Very Low | 0.3Very Low |
| VEHICLE SPEED CONTROL | 0.5Very Low | 0.5Very Low |
| VISIBILITY | —None | 0.9Very Low |
| ENGINE AND ENGINE COOLING | 0.8Very Low | —None |
| FORWARD COLLISION AVOIDANCE | 0.4Very Low | 0.2Very Low |
| FUEL/PROPULSION SYSTEM | 0.3Very Low | 0.3Very Low |
| EXTERIOR LIGHTING | 0.4Very Low | —None |
| SEAT BELTS | 0.1Very Low | —None |
| STRUCTURE | —None | 0.1Very Low |
Complaints per 10,000 units sold, aggregated across all tracked model years from NHTSA owner reports.
Which Is Cheaper to Maintain: KIA Optima or Subaru Legacy?
How Does KIA Optima vs Subaru Legacy Reliability Compare by Year?
| Year | KIA Optima | Subaru Legacy | Edge |
|---|---|---|---|
| 2020 | 72/1000R / 138C | 67/1006R / 121C | KIA Optima |
| 2019 | 72/1001R / 205C | 69/1003R / 123C | KIA Optima |
| 2018 | 70/1002R / 230C | 70/1003R / 116C | Tie |
Best years to cross-shop: The 2020 KIA Optima scored 72/100 and the 2018 Subaru Legacy scored 70/100 — these represent the strongest model years in our tracking range.
Who Should Buy the KIA Optima vs the Subaru Legacy?
KIA Optima vs Subaru Legacy: Common Questions
- Is the KIA Optima more reliable than the Subaru Legacy?
- Based on our data, the Subaru Legacy is more reliable with an average score of 75/100 compared to 71/100. The difference is modest, so both are reasonable choices.
- Which has more recalls, the KIA Optima or the Subaru Legacy?
- The Subaru Legacy has more recalls (19) compared to the KIA Optima (3). More recalls don't always mean worse reliability — some are minor — but it's worth reviewing what each recall covers.
- Which has fewer owner complaints, the KIA Optima or the Subaru Legacy?
- Adjusted for sales volume, the Subaru Legacy has a lower complaint rate at 21.2 per 10,000 vehicles sold versus 23.3 for the KIA Optima. Normalizing by sales gives a fairer comparison than raw totals.
- Which is cheaper to maintain, the KIA Optima or the Subaru Legacy?
- Based on independent repair cost estimates, the KIA Optima is cheaper to maintain at $471/year versus $563/year for the Subaru Legacy.
- Is the KIA Optima or Subaru Legacy safer?
- Both the KIA Optima and Subaru Legacy received the same NHTSA overall safety rating of 5/5 stars. Check the frontal, side, and rollover sub-ratings above for a more detailed comparison.
Related Reliability Comparisons
More KIA Optima comparisons
Decided between KIA Optima and Subaru Legacy? Run a VIN check before you buy — uncover hidden accidents, title issues, and open recalls.
How We Calculate Reliability Scores
Auto Reliability Index scores are calculated on a 0–100 scale using a weighted formula that combines multiple public data sources. Each factor is weighted based on its predictive value for real-world ownership experience.
Key Ranking Factors
Complaint Severity
NHTSA owner complaints weighted by component category (e.g., powertrain, safety systems, electronics, cosmetic) — safety-critical issues carry more weight than cosmetic ones. Adjusted for sales volume so high-volume models aren't unfairly penalized.
Repair Costs
Independent reliability ratings based on repair frequency, average repair costs, and severity of typical repairs for each model.
Recall Impact
Number of NHTSA recalls weighted by severity. “Stop driving” and fire-risk recalls are penalized more heavily than minor software or labeling recalls.
Issue Diversity
Measures how many major vehicle systems (engine, transmission, electrical, braking, etc.) have recorded complaints. A vehicle with issues spread across many systems may indicate systemic quality issues.
Scores are grouped into four tiers:
- 80–100: Excellent— Top-tier reliability, minimal issues
- 60–79: Good— Reliable with some minor concerns
- 40–59: Mixed— Notable issues, research before buying
- 0–39: Risky— Significant problems, proceed with caution
Data is sourced from NHTSA recall records, owner complaint filings, and independent repair databases via vehicles.dev. Scores are recalculated as new data becomes available. While the weighting model is proprietary, all underlying data sources are public and traceable.
See incorrect data? Report an issue