Mercedes-Benz C: 74% pass.

344,288 tests of cars aged 3 and over passed first time 74% of the time in 2025. For cars of the same ages, 70% would be expected: 4 points 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
3 years	90%	88%	2%	8%	403
4 years	85%	86%	2%	12%	2,258
5 years	85%	84%	2%	13%	6,970
6 years	84%	82%	2%	14%	11,601
7 years	81%	79%	3%	16%	19,305
8 years	79%	76%	3%	18%	26,057
9 years	78%	73%	3%	19%	22,426
10 years	76%	70%	3%	20%	24,605
11 years	70%	67%	4%	26%	17,838
12 years	66%	64%	4%	30%	18,389
13 years	65%	62%	4%	31%	16,025
14 years	64%	60%	5%	31%	9,856
15 years	63%	58%	6%	32%	7,226
16 years	62%	57%	6%	32%	7,038
17 years	62%	57%	6%	32%	6,553
18 years	58%	57%	7%	35%	4,350
19 years	58%	57%	7%	35%	3,255
20 years	57%	57%	6%	37%	1,811

Electric diesel
Age of car	Pass first time	All cars this age	Fixed at the station	Failed	Tests
6 years	87%	82%	2%	11%	62
7 years	79%	79%	3%	18%	460
8 years	81%	76%	3%	16%	857
9 years	79%	73%	3%	18%	1,294
10 years	80%	70%	4%	16%	727

Hybrid
Age of car	Pass first time	All cars this age	Fixed at the station	Failed	Tests
3 years	88%	88%	2%	10%	460
4 years	88%	86%	1%	11%	1,742
5 years	86%	84%	1%	13%	2,002
6 years	84%	82%	2%	14%	1,419
7 years	84%	79%	2%	14%	1,974
8 years	83%	76%	3%	14%	3,586
9 years	84%	73%	3%	14%	2,281
10 years	91%	70%	0%	9%	74

Petrol
Age of car	Pass first time	All cars this age	Fixed at the station	Failed	Tests
3 years	90%	88%	1%	9%	104
4 years	87%	86%	1%	12%	1,010
5 years	87%	84%	1%	12%	8,153
6 years	86%	82%	2%	12%	13,225
7 years	84%	79%	2%	14%	10,713
8 years	84%	76%	3%	13%	8,966
9 years	82%	73%	3%	15%	6,593
10 years	81%	70%	4%	16%	6,039
11 years	77%	67%	4%	19%	5,188
12 years	74%	64%	4%	21%	7,078
13 years	74%	62%	4%	22%	5,859
14 years	72%	60%	6%	23%	5,352
15 years	68%	58%	7%	25%	5,618
16 years	67%	57%	7%	26%	4,689
17 years	64%	57%	8%	28%	6,232
18 years	61%	57%	8%	32%	5,556
19 years	61%	57%	7%	32%	4,781
20 years	60%	57%	8%	32%	4,039

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.