Kia Rio vs Kia Stonic maxx: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Kia Rio
76%
MOT pass rate · 141,350 vehicles
Kia Stonic maxx
90%
MOT pass rate · 752 vehicles
More reliable
Verdict: On MOT pass rate, the Kia Stonic maxx is the more reliable of the two — 90% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Kia Rio | Kia Stonic maxx |
|---|---|---|
| MOT pass rate | 76% | 90% ✓ |
| MOT failure rate | 24% | 10% ✓ |
| Faults & advisories per test | 1.8 | 0.9 ✓ |
| Dangerous-fault share | 3% ✓ | 5% |
| Average mileage | 76,214 mi | 38,298 mi |
| Sample size (vehicles) | 141,350 | 752 |
Most common faults
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))
Kia Stonic maxx
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate, the Kia Stonic maxx is the more reliable of the two — 90% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Full Kia Rio report Full Kia Stonic maxx 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.