2021 Kia Rio MOT pass rate: 92.3% (4,276 tests)
Is the 2021 Rio getting worse?
Pass rate of 2021-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2024 | 94.4% +3.8 vs same-age |
|
| 2025 | 90.3% +0.1 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 Rio
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Tyres | 169 | 33.1% |
| 2 | Visibility | 144 | 28.2% |
| 3 | Lamps, reflectors and electrical equipment | 73 | 14.3% |
| 4 | Brakes | 65 | 12.7% |
| 5 | Steering | 24 | 4.7% |
| 6 | Noise, emissions and leaks | 12 | 2.4% |
All Rio years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2006 | 2,757 | 60.0% | -4.5 pts | 87,564 |
| 2007 | 3,469 | 59.7% | -5.4 pts | 88,383 |
| 2008 | 5,925 | 59.3% | -5.8 pts | 87,319 |
| 2009 | 13,989 | 63.0% | -3.4 pts | 79,862 |
| 2010 | 17,807 | 62.9% | -4.5 pts | 81,509 |
| 2011 | 20,178 | 62.9% | -6.3 pts | 78,526 |
| 2012 | 26,550 | 66.7% | -4.5 pts | 81,427 |
| 2013 | 29,323 | 68.8% | -4.5 pts | 73,408 |
| 2014 | 32,520 | 73.2% | -2.6 pts | 65,872 |
| 2015 | 33,641 | 80.7% | +2.0 pts | 56,343 |
| 2016 | 26,134 | 82.8% | +1.4 pts | 48,747 |
| 2017 | 23,889 | 86.3% | +2.3 pts | 44,997 |
| 2018 | 16,876 | 88.7% | +2.3 pts | 36,870 |
| 2019 | 14,312 | 89.3% | +0.9 pts | 29,112 |
| 2020 | 9,279 | 91.1% | +1.1 pts | 23,239 |
| 2021 (this page) | 4,276 | 92.3% | +1.9 pts | 22,610 |
| 2022 | 3,010 | 93.1% | +1.8 pts | 20,928 |
Weighing up which year to buy? See the full ranking: Kia Rio years to avoid.
- Free MOT history checkThe exact car’s failures, advisories and mileage trail — sellers can’t edit it
- Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
- XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
- Autel UK testersAutel professional-grade diagnostic testers
FAQs
Is a 2021 Kia Rio reliable?
2021-registered examples passed 92.3% of their MOT tests (4,276 tests, 2023–2025), +1.9 points versus all UK cars registered in the same year. At roughly 5 years old with a median 22,610 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2021 Rio?
The median tested example shows 22,610 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.