Mercedes-Benz A-Class: 73% pass.

233,391 tests of cars aged 3 and over passed first time 73% of the time in 2025. For cars of the same ages, 72% would be expected: 1 point better than that.

How it does as it ages.

01 / By age

Source: Anonymised MOT tests and results (Driver and Vehicle Standards Agency) Checked 4 Nov 2026, 13:37

Diesel
Age of car	Pass first time	All cars this age	Fixed at the station	Failed	Tests
5 years	84%	84%	3%	13%	1,323
6 years	82%	82%	3%	15%	14,741
7 years	78%	79%	4%	18%	22,780
8 years	75%	76%	4%	21%	27,990
9 years	72%	73%	4%	23%	24,711
10 years	69%	70%	6%	25%	20,277
11 years	67%	67%	5%	28%	14,165
12 years	66%	64%	6%	28%	5,167
13 years	66%	62%	6%	28%	2,161
14 years	60%	60%	7%	32%	1,698
15 years	56%	58%	7%	37%	1,877
16 years	57%	57%	5%	38%	1,568
17 years	57%	57%	6%	37%	1,447
18 years	55%	57%	7%	38%	928
19 years	54%	57%	9%	38%	777
20 years	56%	57%	10%	35%	259

Petrol
Age of car	Pass first time	All cars this age	Fixed at the station	Failed	Tests
3 years	97%	88%	0%	3%	33
4 years	91%	86%	5%	4%	57
5 years	88%	84%	2%	11%	1,857
6 years	85%	82%	2%	12%	15,625
7 years	82%	79%	3%	15%	14,722
8 years	80%	76%	3%	16%	10,642
9 years	78%	73%	3%	19%	6,834
10 years	75%	70%	5%	20%	4,335
11 years	73%	67%	5%	22%	4,559
12 years	71%	64%	5%	23%	2,928
13 years	68%	62%	6%	26%	3,792
14 years	65%	60%	6%	29%	3,443
15 years	62%	58%	6%	32%	4,490
16 years	59%	57%	7%	33%	4,502
17 years	58%	57%	9%	34%	4,267
18 years	59%	57%	9%	32%	3,192
19 years	58%	57%	9%	33%	2,319
20 years	61%	57%	9%	30%	1,087

Ages with fewer than 30 tests are left out. "All cars this age" is every make and model at that age, so you can see whether this one does better or worse than most.

A pass rate is the share of normal MOT tests a car passed first time, with no repair needed at the test station. A car that failed and was fixed on the spot is counted separately. Retests, aborted tests and other vehicles are left out.
The figures say how often cars of a kind pass, not how reliable or safe they are. Cars that are looked after better, or that are driven fewer miles, pass more often, and that differs by model. Groups of fewer than 30 tests are left out.
Make and model names are as DVSA records them, and a model can appear under more than one name.

More on Mercedes-Benz and costs.

02 / Related

Data sources

Anonymised MOT tests and results (Driver and Vehicle Standards Agency). Contains public sector information licensed under the Open Government Licence v3.0. MOT test results for cars, counted by make, model and age from DVSA's anonymised data. The counts are ours; DVSA does not endorse them.