2020 Kia Stonic Maxx S-A — MOT failures & pass rate
Across 662 MOT tests analysed for the 2020 Kia Stonic Maxx S-A, the most common recorded failure areas were visibility, brakes and suspension. Its pass rate of 92.0% was above the average for cars of a similar age (90.5%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Visibility | 6.0% | 40 |
| 2 | Brakes | 4.1% | 27 |
| 3 | Suspension | 1.2% | 8 |
| 4 | Tyres | 0.9% | 6 |
| 5 | Lighting & signalling | 0.6% | 4 |
| 6 | Emissions & environmental | 0.4% | 3 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 42 |
| 2 | Brake pads | 28 |
| 3 | Ball joint dust cover | 4 |
| 4 | Malfunction indicator lamp | 3 |
| 5 | Service brake performance | 3 |
| 6 | Shock absorbers | 3 |
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 | 16.6% | 110 |
| 2 | Brakes | 16.2% | 107 |
| 3 | Other defects | 6.8% | 45 |
| 4 | Visibility | 2.4% | 16 |
| 5 | Suspension | 1.1% | 7 |
| 6 | Lighting & signalling | 0.6% | 4 |
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 | 459 | 5.9% |
| 30-60k | 192 | 13.0% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 208 | 4.3% |
| 2024 | 222 | 9.9% |
| 2025 | 223 | 9.4% |
What to check before buying a 2020 Stonic Maxx S-A
Before buying a 2020 Kia Stonic Maxx S-A, focus on the areas it most often fails on. Visibility accounted for 6.0% of tests for this year.
- Visibility (6.0% 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 (4.1% 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.
- Suspension (1.2% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
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 Maxx S-As pass their MOT?
92.0% of the 662 2020 Kia Stonic Maxx S-A MOT tests in this dataset passed — a 8.0% fail rate.
What is the most common MOT failure on a 2020 Kia Stonic Maxx S-A?
Visibility, recorded in 6.0% of tests, followed by brakes (4.1%).
Does the 2020 Stonic Maxx S-A get worse with mileage?
Its MOT fail rate rises from 5.9% in the 0-30k band to 13.0% in the 30-60k band.
Methodology & source. Based on 662 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.