2018 Kia Stonic MOT pass rate: 88.9% (20,134 tests)
Is the 2018 Stonic getting worse?
Pass rate of 2018-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2023 | 89.8% +1.8 vs same-age |
|
| 2024 | 88.6% +2.4 vs same-age |
|
| 2025 | 88.1% +3.3 vs same-age |
The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.
What fails on a 2018 Stonic
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Brakes | 1,243 | 33.9% |
| 2 | Tyres | 846 | 23.1% |
| 3 | Visibility | 602 | 16.4% |
| 4 | Lamps, reflectors and electrical equipment | 449 | 12.3% |
| 5 | Suspension | 200 | 5.5% |
| 6 | Noise, emissions and leaks | 168 | 4.6% |
All Stonic years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2017 | 2,132 | 88.0% | +4.0 pts | 44,946 |
| 2018 (this page) | 20,134 | 88.9% | +2.5 pts | 39,752 |
| 2019 | 22,963 | 90.8% | +2.4 pts | 31,139 |
| 2020 | 10,693 | 93.0% | +3.0 pts | 22,277 |
- Free MOT history checkThe exact car’s failures, advisories and mileage trail — sellers can’t edit it
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- XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
- Autel UK testersAutel professional-grade diagnostic testers
FAQs
Is a 2018 Kia Stonic reliable?
2018-registered examples passed 88.9% of their MOT tests (20,134 tests, 2023–2025), +2.5 points versus all UK cars registered in the same year. At roughly 8 years old with a median 39,752 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2018 Stonic?
The median tested example shows 39,752 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.
Should I buy the petrol or diesel 2018 Stonic?
In this cohort petrols pass 89.6% of tests against 86.3% for diesels. Mileage and use can explain part of that gap, so treat it as a reason to inspect DPF and emissions history, not a fuel-type verdict.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.