2020 Kia Stonic Maxx — MOT failures & pass rate
Across 1,440 MOT tests analysed for the 2020 Kia Stonic Maxx, the most common recorded failure areas were visibility, brakes and tyres. Its pass rate of 93.3% was above the average for cars of a similar age (90.6%). Higher-mileage examples failed more often — 10.5% in the 60-90k group versus 4.6% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Visibility | 4.4% | 63 |
| 2 | Brakes | 2.4% | 34 |
| 3 | Tyres | 2.1% | 31 |
| 4 | Lighting & signalling | 1.4% | 20 |
| 5 | Suspension | 0.7% | 10 |
| 6 | Emissions & environmental | 0.6% | 8 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 59 |
| 2 | Brake pads | 32 |
| 3 | Headlamp aim | 16 |
| 4 | Washers | 12 |
| 5 | Tread depth | 11 |
| 6 | Ball joint dust cover | 7 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Brakes | 16.2% | 233 |
| 2 | Tyres | 15.3% | 220 |
| 3 | Other defects | 5.8% | 83 |
| 4 | Visibility | 3.3% | 47 |
| 5 | Suspension | 0.8% | 12 |
| 6 | Steering | 0.4% | 6 |
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 | 898 | 4.6% |
| 30-60k | 498 | 10.2% |
| 60-90k | 38 | 10.5% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 468 | 4.9% |
| 2024 | 479 | 7.5% |
| 2025 | 477 | 7.5% |
What to check before buying a 2020 Stonic Maxx
Before buying a 2020 Kia Stonic Maxx, focus on the areas it most often fails on. Visibility accounted for 4.4% of tests for this year.
- Visibility (4.4% 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.
- Brakes (2.4% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Tyres (2.1% 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.
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 2020 Kia Stonic Maxxs pass their MOT?
93.3% of the 1,440 2020 Kia Stonic Maxx MOT tests in this dataset passed — a 6.7% fail rate.
What is the most common MOT failure on a 2020 Kia Stonic Maxx?
Visibility, recorded in 4.4% of tests, followed by brakes (2.4%).
Does the 2020 Stonic Maxx get worse with mileage?
Its MOT fail rate rises from 4.6% in the 0-30k band to 10.5% in the 60-90k band.
Methodology & source. Based on 1,440 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.