2021 Hyundai Ioniq MOT pass rate: 91.1% (20,757 tests)
Is the 2021 Ioniq getting worse?
Pass rate of 2021-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2024 | 90.6% -0.0 vs same-age |
|
| 2025 | 91.6% +1.4 vs same-age |
The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.
What fails on a 2021 Ioniq
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Tyres | 1,133 | 37.2% |
| 2 | Visibility | 684 | 22.4% |
| 3 | Lamps, reflectors and electrical equipment | 557 | 18.3% |
| 4 | Brakes | 460 | 15.1% |
| 5 | Body, chassis, structure | 54 | 1.8% |
| 6 | Noise, emissions and leaks | 34 | 1.1% |
All Ioniq years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2017 | 16,998 | 88.3% | +4.3 pts | 72,480 |
| 2018 | 25,710 | 89.4% | +3.0 pts | 66,129 |
| 2019 | 26,882 | 90.5% | +2.1 pts | 50,790 |
| 2020 | 21,653 | 91.6% | +1.7 pts | 37,372 |
| 2021 (this page) | 20,757 | 91.1% | +0.7 pts | 37,817 |
| 2022 | 5,153 | 90.9% | -0.3 pts | 26,071 |
Weighing up which year to buy? See the full ranking: Hyundai Ioniq years to avoid.
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FAQs
Is a 2021 Hyundai Ioniq reliable?
2021-registered examples passed 91.1% of their MOT tests (20,757 tests, 2023–2025), +0.7 points versus all UK cars registered in the same year. At roughly 5 years old with a median 37,817 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2021 Ioniq?
The median tested example shows 37,817 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.