2018 Hyundai Ioniq MOT pass rate: 89.4% (25,710 tests)

2018-registered Hyundai Ioniqs passed 89.4% of 25,710 MOT tests in 2023–2025 — 3.0 points better than all UK cars registered in 2018 (86.4%). This is one of the strongest Ioniq years in the age-adjusted MOT ranking, although the individual car still matters more.

89.4%Pass rate, 2018 cars

103.0Age-adjusted index (100 = average)

25,710Tests analysed

66,129 miMedian mileage at test

Is the 2018 Ioniq getting worse?

Pass rate of 2018-registered cars across recent test years:

Test year	Pass rate
2023	90.4% +2.3 vs same-age
2024	89.1% +2.9 vs same-age
2025	88.6% +3.9 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 2018 Ioniq

#	System	Defects recorded	Share
1	Tyres	1,512	30.3%
2	Brakes	1,380	27.7%
3	Lamps, reflectors and electrical equipment	941	18.9%
4	Visibility	506	10.1%
5	Suspension	254	5.1%
6	Noise, emissions and leaks	110	2.2%

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 (this page)	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	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.

Buying a 2018 Ioniq? Two checks first

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 2018 Hyundai Ioniq reliable?

2018-registered examples passed 89.4% of their MOT tests (25,710 tests, 2023–2025), +3.0 points versus all UK cars registered in the same year. At roughly 8 years old with a median 66,129 miles, condition now varies car by car — always check the individual MOT history.

What mileage is too high for a 2018 Ioniq?

The median tested example shows 66,129 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.