2021 Kia Stonic Gt-Line Isg Mhev — MOT failures & pass rate
Across 2,073 MOT tests analysed for the 2021 Kia Stonic Gt-Line Isg Mhev, the most common recorded failure areas were visibility, tyres and lighting & signalling. Its pass rate of 94.7% was above the average for cars of a similar age (91.2%). Higher-mileage examples failed more often — 13.2% in the 60-90k group versus 4.2% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Visibility | 4.9% | 102 |
| 2 | Tyres | 1.5% | 30 |
| 3 | Lighting & signalling | 1.5% | 30 |
| 4 | Brakes | 0.9% | 18 |
| 5 | Emissions & environmental | 0.3% | 7 |
| 6 | Other defects | 0.2% | 4 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 109 |
| 2 | Headlamp aim | 28 |
| 3 | Tread depth | 20 |
| 4 | Washers | 17 |
| 5 | Brake pads | 15 |
| 6 | Malfunction indicator lamp | 6 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 14.2% | 294 |
| 2 | Brakes | 9.7% | 201 |
| 3 | Other defects | 5.1% | 106 |
| 4 | Visibility | 3.4% | 71 |
| 5 | Steering | 1.4% | 29 |
| 6 | Emissions & environmental | 0.7% | 15 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 1,415 | 4.2% |
| 30-60k | 617 | 7.3% |
| 60-90k | 38 | 13.2% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 1,020 | 4.8% |
| 2025 | 1,042 | 5.9% |
What to check before buying a 2021 Stonic Gt-Line Isg Mhev
Before buying a 2021 Kia Stonic Gt-Line Isg Mhev, focus on the areas it most often fails on. Visibility accounted for 4.9% of tests for this year.
- Visibility (4.9% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
- Tyres (1.5% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Lighting & signalling (1.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2021 Kia Stonic Gt-Line Isg Mhevs pass their MOT?
94.7% of the 2,073 2021 Kia Stonic Gt-Line Isg Mhev MOT tests in this dataset passed — a 5.3% fail rate.
What is the most common MOT failure on a 2021 Kia Stonic Gt-Line Isg Mhev?
Visibility, recorded in 4.9% of tests, followed by tyres (1.5%).
Does the 2021 Stonic Gt-Line Isg Mhev get worse with mileage?
Its MOT fail rate rises from 4.2% in the 0-30k band to 13.2% in the 60-90k band.
Methodology & source. Based on 2,073 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.