2021 Hyundai Ioniq — MOT failures & pass rate
Across 25,691 MOT tests analysed for the 2021 Hyundai Ioniq, the most common recorded failure areas were tyres, visibility and lighting & signalling. Its pass rate of 91.8% was in line with the average for small family cars of a similar age (91.8%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 4.0% | 1,029 |
| 2 | Visibility | 4.0% | 1,016 |
| 3 | Lighting & signalling | 3.6% | 921 |
| 4 | Brakes | 1.3% | 333 |
| 5 | Body, structure & corrosion | 0.3% | 64 |
| 6 | Emissions & environmental | 0.2% | 55 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 1,049 |
| 2 | Headlamp aim | 770 |
| 3 | Tread depth | 598 |
| 4 | Headlamp levelling device | 281 |
| 5 | Washers | 240 |
| 6 | Rbt (sp) | 170 |
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 | 18.4% | 4,715 |
| 2 | Brakes | 4.9% | 1,247 |
| 3 | Other defects | 4.3% | 1,101 |
| 4 | Visibility | 2.6% | 659 |
| 5 | Lighting & signalling | 0.8% | 215 |
| 6 | Suspension | 0.3% | 83 |
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 | 9,489 | 6.7% |
| 30-60k | 11,261 | 9.1% |
| 60-90k | 3,615 | 8.7% |
| 90-120k | 1,002 | 8.3% |
| 120-150k | 252 | 12.3% |
| 150k+ | 72 | 8.3% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Hybrid | 17,103 | 8.6% |
| Electric | 8,578 | 7.3% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 82 | 2.4% |
| 2022 | 616 | 4.1% |
| 2023 | 2,234 | 7.8% |
| 2024 | 11,690 | 8.8% |
| 2025 | 11,069 | 7.9% |
What to check before buying a 2021 Ioniq
Before buying a 2021 Hyundai Ioniq, focus on the areas it most often fails on. Tyres accounted for 4.0% of tests for this year.
- Tyres (4.0% 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 (4.0% 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.
- Lighting & signalling (3.6% 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 Hyundai Ioniqs pass their MOT?
91.8% of the 25,691 2021 Hyundai Ioniq MOT tests in this dataset passed — a 8.2% fail rate.
What is the most common MOT failure on a 2021 Hyundai Ioniq?
Tyres, recorded in 4.0% of tests, followed by visibility (4.0%).
Does the 2021 Ioniq get worse with mileage?
Its MOT fail rate rises from 6.7% in the 0-30k band to 8.3% in the 150k+ band.
Methodology & source. Based on 25,691 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.