2020 Mercedes-Benz GLA MOT pass rate: 89.9% (4,103 tests)

2020-registered Mercedes-Benz GLAs passed 89.9% of 4,103 MOT tests in 2023–2025 — broadly in line with same-age cars (89.9%).

89.9%Pass rate, 2020 cars

100.0Age-adjusted index (100 = average)

4,103Tests analysed

27,762 miMedian mileage at test

90.0% / 50.0%Petrol vs diesel pass rate

Is the 2020 GLA getting worse?

Pass rate of 2020-registered cars across recent test years:

Test year	Pass rate
2023	91.7% +0.9 vs same-age
2024	90.3% +0.3 vs same-age
2025	87.6% -1.3 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 2020 GLA

#	System	Defects recorded	Share
1	Tyres	321	52.2%
2	Brakes	136	22.1%
3	Visibility	67	10.9%
4	Body, chassis, structure	19	3.1%
5	Lamps, reflectors and electrical equipment	17	2.8%
6	Suspension	15	2.4%

All GLA years compared

Registration year	Tests	Pass rate	Vs same-age	Median mileage
2014	10,206	83.4%	+7.5 pts	73,392
2015	26,123	82.1%	+3.4 pts	68,862
2016	31,346	83.0%	+1.7 pts	61,490
2017	37,781	85.1%	+1.1 pts	51,994
2018	48,276	87.6%	+1.3 pts	42,565
2019	34,572	88.5%	+0.1 pts	35,018
2020 (this page)	4,103	89.9%	-0.0 pts	27,762

Weighing up which year to buy? See the full ranking: Mercedes-Benz GLA years to avoid.

Buying a 2020 GLA? 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 2020 Mercedes-Benz GLA reliable?

2020-registered examples passed 89.9% of their MOT tests (4,103 tests, 2023–2025), -0.0 points versus all UK cars registered in the same year. At roughly 6 years old with a median 27,762 miles, condition now varies car by car — always check the individual MOT history.

What mileage is too high for a 2020 GLA?

The median tested example shows 27,762 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.