Is the Mercedes-Benz C-Class reliable?

On MOT evidence the Mercedes-Benz C-Class is above average. It passes 77.0% of tests once age and mileage are accounted for, against a national average of 72.3%, which ranks it 86 of 262 models with enough data for a fair comparison. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.

What is the most common MOT failure on a Mercedes-Benz C-Class?

The item recorded most often is "A suspension pin, bush or joint excessively worn", which appears in 23.5% of failed Mercedes-Benz C-Class tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a Mercedes-Benz C-Class?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 28.3% of all Mercedes-Benz C-Class tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Mercedes-Benz C-Class usually have at its MOT?

The average odometer reading recorded at test is 88,550 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Which Mercedes-Benz C-Class years are the most reliable?

Going by MOT pass rate, Mercedes-Benz C-Class cars first registered 2020–2022 do best at 86.9%, and those registered 2010 and earlier do worst at 62.7%. But that ordering is mostly age, not build year: almost every model passes less often as it wears, so the newest cars top this list whatever they are. A specific year looking strong here means little on its own; the failure items above, and the individual car's own MOT history, tell you far more.

Does a Mercedes-Benz C-Class get harder to pass as it ages?

Yes. At 3 to 5 years old, 86.9% of Mercedes-Benz C-Class tests pass. By fifteen years or more, that falls to 62.7%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

Are most Mercedes-Benz C-Class models petrol or diesel?

Of the Mercedes-Benz C-Class cars tested, 59% are diesel, 34% are petrol, 5% are hybrid. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

Model reliability file

Mercedes-Benz C-Class MOT pass rate & common failures

From 358,975 recorded MOT tests of the Mercedes-Benz C-Class, published by DVSA.

Data updated 29 July 2026

Quick answer

The Mercedes-Benz C-Class passes 77.0% of MOT tests once results are adjusted for the age and mileage of the cars tested, against a national average of 72.3%. That is above average, ranking it 86 of 262 models with enough data to compare fairly. Based on 358,975 tests. Its most commonly recorded failure is suspension pin, bush or joint excessively worn, which appears in 23.5% of failed tests. Cars of this model average 88,550 miles on the odometer when tested.

At a glance

Pass rate, adjusted for age and mileage

77.0%national average72.3%unadjusted74.7%range covered100%rank86 of 262

The C-Class is 4.7 percentage points above the national pass rate once age and mileage are accounted for, which is above average. The unadjusted figure is 74.7%; the difference is what the age and mileage of this model’s fleet was hiding.

DVSA recorded wording

Most common failure items

Share of failed Mercedes-Benz C-Class tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A suspension pin, bush or joint excessively worn23.5%
18,099 occurrencesSuspension arm bush worn explained
2.Tyre tread depth not in accordance with the requirements19.4%
14,894 occurrencesTyre worn close to the legal limit explained
3.A spring or spring component fractured or seriously weakened14.1%
10,852 occurrencesRoad spring broken or fractured explained
4.A tyre cords visible or damaged9.6%
7,367 occurrencesTyre ply or cord exposed, or the casing separating explained
5.A tyre seriously damaged8.2%
6,331 occurrencesTyre damaged or deteriorated explained
6.A suspension joint dust cover missing or no longer prevents the ingress of dirt etc8.0%
6,183 occurrencesSuspension joint dust cover missing or split explained
7.Brake pipe damaged or excessively corroded7.8%
6,035 occurrencesBrake pipe corroded explained
8.A brake lining or pad worn below 1.5mm6.6%
5,078 occurrencesBrake drum or shoe worn or contaminated explained
9.Parking brake efficiency below minimum requirement6.0%
4,617 occurrencesParking brake efficiency too low explained
10.Engine MIL illuminated indicating a malfunction5.5%
4,224 occurrencesEngine management light on, or not working explained

Warnings without a failure

Most common advisories

Share of all Mercedes-Benz C-Class tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Tyre tread depth not in accordance with the requirements28.3%
101,549 testsTyre worn close to the legal limit explained
2.Brake pipe damaged or excessively corroded12.5%
44,982 testsBrake pipe corroded explained
3.Brake disc or drum excessively weakened, insecure or fractured11.2%
40,150 testsBrake disc worn, pitted or scored explained
4.A brake lining or pad worn below 1.5mm8.8%
31,517 testsBrake drum or shoe worn or contaminated explained
5.A tyre seriously damaged7.4%
26,404 testsTyre damaged or deteriorated explained
6.A suspension pin, bush or joint excessively worn6.5%
23,441 testsSuspension arm bush worn explained
7.A suspension pin, bush or joint excessively worn6.0%
21,680 testsSuspension arm bush worn explained
8.Brake disc or drum significantly and obviously worn4.9%
17,418 testsBrake disc worn, pitted or scored explained

The rest of the record

Everything else recorded on the Mercedes-Benz C-Class

The 19 other defects testers recorded on this model, beyond the most common listed above. Each links to what it means and what it takes to put right.

Known faults

Mercedes-Benz C-Class common problems, by part and by year

The same failure record read the way a buyer asks the question: which parts wear out on a C-Class, when they start, and how each registration year compares — including the steps that mark a generation change.

C-Class common problems and results by year

How wear changes the picture

C-Class pass rate by age and registration year

How often the Mercedes-Benz C-Class passes at each age, with the years those cars were first registered. Tests are from 2025, so a car aged 3 to 5 was first used in 2020–2022.

3–5 yrsreg. 2020–202287%

6–8 yrsreg. 2017–201983%

9–11 yrsreg. 2014–201678%

12–14 yrsreg. 2011–201368%

15+ yrsreg. 2010 and earlier63%

Read this as an age curve rather than a verdict on particular model years. Nearly every car passes less often as it gets older, so a newer C-Class outscoring an older one says more about wear than about how that year’s cars were built. Bands holding too few tests to be meaningful are omitted rather than shown as a rate.

What gets tested

The C-Class fleet

Average mileage recorded at test: 88,550
Fuel mix of tested cars: Diesel59.4%
Petrol33.7%
Hybrid5.2%
Diesel hybrid1.7%

Trim names grouped into this model (40)

Recorded exactly as DVSA holds them. Trim-level names are rolled up so one model is not split across a dozen thin pages.

AMG C 43
AMG C 43 4MATIC
AMG C 43 EDITION 4MATIC AUTO
AMG C 43 EDITION PREM + 4M A
AMG C 43 EDITION PREMIUM 4M A
AMG C 43 NIGHT ED PREM + 4M A
AMG C 43 PREMIUM + 4MATIC A
AMG C 43 PREMIUM 4MATIC AUTO
AMG C 43 PREMIUM MHEV 4MATIC A
AMG C 63 S
AMG C 63 S NIGHT ED PREM + A
AMG C 63 S PREMIUM + AUTO
C 180
C 180 AMG LINE ED PREMIUM A
C 180 AMG LINE EDITION AUTO
C 180 SPORT EDITION PREMIUM+ A
C 200
C 200 AMG LINE ED PREM + A
C 200 AMG LINE ED PREM D A
C 200 AMG LINE ED PREM MHEV A
C 200 AMG LINE EDITION AUTO
C 200 AMG LINE EDITION MHEV A
C 200 AMG LINE MHEV AUTO
C 200 AMG LINE PREM + MHEV A
C 200 AMG LINE PREMIUM MHEV A
C 200 AUTO
C 200 CDI
C 200 EXCLUSIVE LUXURY MHEV A
C 200 SPORT EDITION AUTO
C 200 SPORT EDITION D AUTO
C 200 SPORT MHEV AUTO
C 200 SPORT PREMIUM MHEV AUTO
C 220
C 220 AMG LINE D MHEV AUTO
C 220 AMG LINE ED PREM D A
C 220 AMG LINE EDITION D 4M A
C 220 AMG LINE EDITION D AUTO
C 220 AMG LINE NGT ED PREM D A
C 220 AMG LINE PREM D MHEV A
C 220 AMG LNE ED PREM + D 4M A

Check a specific Mercedes-Benz C-Class

A model average tells you the pattern. Its own MOT record tells you the car.

Compare within the range

Other Mercedes-Benz models

Mercedes-Benz A-Class — 73.3% adjusted
Mercedes-Benz E-Class — 78.5% adjusted
Mercedes-Benz GLA — 82.3% adjusted
Mercedes-Benz Vito — 71.0% adjusted
Mercedes-Benz GLC — 85.9% adjusted
Mercedes-Benz CLA — 78.6% adjusted
All Mercedes-Benz models

Similar test volumes

Compare against other makes

Mini Cooper — 75.9% adjusted, ranked 97
Honda Jazz — 75.5% adjusted, ranked 101
Fiat 500 — 65.3% adjusted, ranked 219
Nissan Juke — 66.5% adjusted, ranked 210

Common questions

Is the Mercedes-Benz C-Class reliable?: On MOT evidence the Mercedes-Benz C-Class is above average. It passes 77.0% of tests once age and mileage are accounted for, against a national average of 72.3%, which ranks it 86 of 262 models with enough data for a fair comparison. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.
What is the most common MOT failure on a Mercedes-Benz C-Class?: The item recorded most often is "A suspension pin, bush or joint excessively worn", which appears in 23.5% of failed Mercedes-Benz C-Class tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a Mercedes-Benz C-Class?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 28.3% of all Mercedes-Benz C-Class tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Mercedes-Benz C-Class usually have at its MOT?: The average odometer reading recorded at test is 88,550 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.
Which Mercedes-Benz C-Class years are the most reliable?: Going by MOT pass rate, Mercedes-Benz C-Class cars first registered 2020–2022 do best at 86.9%, and those registered 2010 and earlier do worst at 62.7%. But that ordering is mostly age, not build year: almost every model passes less often as it wears, so the newest cars top this list whatever they are. A specific year looking strong here means little on its own; the failure items above, and the individual car's own MOT history, tell you far more.
Does a Mercedes-Benz C-Class get harder to pass as it ages?: Yes. At 3 to 5 years old, 86.9% of Mercedes-Benz C-Class tests pass. By fifteen years or more, that falls to 62.7%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.
Are most Mercedes-Benz C-Class models petrol or diesel?: Of the Mercedes-Benz C-Class cars tested, 59% are diesel, 34% are petrol, 5% are hybrid. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. The adjusted rate is directly standardised across twenty-five age and mileage bands and reweighted onto the national distribution, so this model is compared against cars that have lived a similar life rather than against a younger or lighter-used fleet.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.