2018 Mitsubishi Asx MOT pass rate: 89.7% (6,490 tests)

2018-registered Mitsubishi Asxs passed 89.7% of 6,490 MOT tests in 2023–2025 — 3.4 points better than all UK cars registered in 2018 (86.4%). This is one of the strongest Asx years in the age-adjusted MOT ranking, although the individual car still matters more.

89.7%Pass rate, 2018 cars

103.4Age-adjusted index (100 = average)

6,490Tests analysed

41,644 miMedian mileage at test

89.7% / 89.8%Petrol vs diesel pass rate

Is the 2018 Asx getting worse?

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

Test year	Pass rate
2023	92.3% +4.2 vs same-age
2024	89.9% +3.7 vs same-age
2025	87.0% +2.3 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 Asx

#	System	Defects recorded	Share
1	Brakes	403	33.7%
2	Tyres	300	25.1%
3	Suspension	169	14.1%
4	Visibility	128	10.7%
5	Lamps, reflectors and electrical equipment	106	8.9%
6	Steering	25	2.1%

All Asx years compared

Registration year	Tests	Pass rate	Vs same-age	Median mileage
2010	4,738	67.2%	-0.1 pts	112,501
2011	6,203	70.7%	+1.6 pts	105,110
2012	6,240	73.5%	+2.3 pts	95,450
2013	7,194	73.3%	-0.0 pts	85,248
2014	11,031	75.2%	-0.6 pts	78,452
2015	13,418	80.4%	+1.7 pts	69,236
2016	9,432	83.6%	+2.2 pts	59,914
2017	11,789	85.7%	+1.6 pts	50,842
2018 (this page)	6,490	89.7%	+3.4 pts	41,644
2019	3,401	91.4%	+3.0 pts	32,560

Weighing up which year to buy? See the full ranking: Mitsubishi Asx years to avoid.

Buying a 2018 Asx? 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 Mitsubishi Asx reliable?

2018-registered examples passed 89.7% of their MOT tests (6,490 tests, 2023–2025), +3.4 points versus all UK cars registered in the same year. At roughly 8 years old with a median 41,644 miles, condition now varies car by car — always check the individual MOT history.

What mileage is too high for a 2018 Asx?

The median tested example shows 41,644 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.