2021 Kia Niro 4 Ev — MOT failures & pass rate
Across 17,513 MOT tests analysed for the 2021 Kia Niro 4 Ev, the most common recorded failure areas were tyres, visibility and lighting & signalling. Its pass rate of 92.4% was in line with the average for cars of a similar age (91.4%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 5.9% | 1,041 |
| 2 | Visibility | 2.7% | 468 |
| 3 | Lighting & signalling | 1.5% | 267 |
| 4 | Brakes | 0.4% | 73 |
| 5 | Suspension | 0.2% | 28 |
| 6 | Other defects | 0.1% | 21 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 490 |
| 2 | Tread depth | 485 |
| 3 | Headlamp aim | 154 |
| 4 | Registration plate lamp(s) | 79 |
| 5 | Washers | 64 |
| 6 | Service brake performance | 41 |
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 | 21.6% | 3,787 |
| 2 | Other defects | 5.5% | 958 |
| 3 | Brakes | 4.1% | 717 |
| 4 | Visibility | 2.7% | 470 |
| 5 | Lighting & signalling | 0.8% | 140 |
| 6 | Suspension | 0.8% | 138 |
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 | 6,574 | 6.4% |
| 30-60k | 7,877 | 8.9% |
| 60-90k | 2,071 | 7.1% |
| 90-120k | 633 | 7.0% |
| 120-150k | 211 | 4.3% |
| 150k+ | 147 | 7.5% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2022 | 448 | 2.7% |
| 2023 | 1,037 | 4.5% |
| 2024 | 7,910 | 7.7% |
| 2025 | 8,106 | 8.2% |
What to check before buying a 2021 Niro 4 Ev
Before buying a 2021 Kia Niro 4 Ev, focus on the areas it most often fails on. Tyres accounted for 5.9% of tests for this year.
- Tyres (5.9% 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.
- Visibility (2.7% 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.
- 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 Niro 4 Evs pass their MOT?
92.4% of the 17,513 2021 Kia Niro 4 Ev MOT tests in this dataset passed — a 7.6% fail rate.
What is the most common MOT failure on a 2021 Kia Niro 4 Ev?
Tyres, recorded in 5.9% of tests, followed by visibility (2.7%).
Does the 2021 Niro 4 Ev get worse with mileage?
Its MOT fail rate rises from 6.4% in the 0-30k band to 7.5% in the 150k+ band.
Methodology & source. Based on 17,513 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.