Kia Optima 4 isg crdi s-a vs Kia Rio: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Kia Optima 4 isg crdi s-a
95%
MOT pass rate · 14 vehicles
Kia Rio
76%
MOT pass rate · 141,350 vehicles
Verdict: On MOT pass rate the Kia Optima 4 isg crdi s-a (95%) and Kia Rio (76%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Kia Optima 4 isg crdi s-a | Kia Rio |
|---|---|---|
| MOT pass rate | 95% ✓ | 76% |
| MOT failure rate | 5% ✓ | 24% |
| Faults & advisories per test | 0.0 ✓ | 1.8 |
| Dangerous-fault share | — ✓ | 3% |
| Average mileage | 79,714 mi | 76,214 mi |
| Sample size (vehicles) | 14 | 141,350 |
Most common faults
Kia Optima 4 isg crdi s-a
No fault breakdown available.
Kia Rio
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
Reliability FAQ
On MOT pass rate the Kia Optima 4 isg crdi s-a (95%) and Kia Rio (76%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Kia Optima 4 isg crdi s-a report Full Kia Rio report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.