Mercedes-Benz Cla MOT pass rate and common problems
87.2% of 128,314 Mercedes-Benz Cla MOT tests pass.
The Cla has a pass rate of 87.2%, a little higher than the average across all Mercedes-Benz models (83.5%).
The Mercedes-Benz Cla passes its MOT 87.2% of the time — well above the national average for cars, which sits at 79.2%.
Own this Mercedes-Benz Cla?
This is the average across every Mercedes-Benz Cla in the dataset. Look up your own registration for its actual MOT history, and a free place to keep its maintenance records.
Have service invoices? Upload and keep them with your car’s history →
How to check and keep your Mercedes-Benz’s service history →
Pass rate by vehicle age
Pass rate declines noticeably with age, from 91.3% at 0–3 years to 81.7% at 10–15 years.
| Vehicle age | Pass rate | Tests | Average mileage |
|---|---|---|---|
| 0–3 years | 91.3% | 13,906 | 28,739 miles |
| 3–6 years | 89.9% | 48,404 | 39,789 miles |
| 6–10 years | 84.8% | 57,669 | 71,684 miles |
| 10–15 years | 81.7% | 8,335 | 91,695 miles |
| 15+ years | no tests recorded | 0 | no reading |
Common MOT failure reasons for the Mercedes-Benz Cla
The most common reason the Mercedes-Benz Cla fails its MOT is tyres — present in 49.0% of failed tests, most often logged as "Tread depth below requirements of 1.6mm".
| Category | Share of failed tests | Example |
|---|---|---|
| Tyres | 49.0% | Tread depth below requirements of 1.6mm |
| Lamps, reflectors and electrical equipment | 19.5% | Too low |
| Brakes | 18.4% | Less than 1.5 mm thick |
| Suspension | 16.3% | Fractured or broken |
| Visibility | 14.4% | Provides insufficient washer liquid |
| Noise, emissions and leaks | 8.6% | Inoperative or indicates a malfunction |
| Seat belts and supplementary restraint systems | 4.6% | Warning lamp indicates a fault |
| Road Wheels | 4.2% | Fixing missing |
| Identification of the vehicle | 4.2% | Does not conform to the specified requirements |
| Body, chassis, structure | 1.8% | Constant velocity boot split or insecure, no longer prevents the ingress of dirt |
Buying a used Mercedes-Benz Cla: what to check
These checks follow the Mercedes-Benz Cla’s own MOT record: the areas it fails on most often, and how that changes as the car gets older. None of them replaces a mechanic’s inspection, but they tell you where to look first.
The biggest drop in pass rate for the Mercedes-Benz Cla comes between 3–6 years and 6–10 years old, from 89.9% to 84.8%. If you are looking at one in or just past that range, read its MOT history closely.
By mileage, the steepest fall is from 0–30,000 mi to 30,000–60,000 mi: 93.2% down to 88.3%. Mileage matters as well as age, so compare the car’s recorded mileages with its year.
1. Tyres
Recorded in 49.0% of failed Mercedes-Benz Cla MOTs.
Check tread depth across the whole width of every tyre, including the inner edge. Uneven wear can point to alignment or suspension problems. Look for cuts and bulges in the sidewalls.
2. Lights and electrics
Recorded in 19.5% of failed Mercedes-Benz Cla MOTs.
Walk round with the lights on: headlights (dipped and main), indicators, brake lights, fog light and number-plate lamp. Check the dashboard warning lights come on with the ignition, then go out once the engine starts.
3. Brakes
Recorded in 18.4% of failed Mercedes-Benz Cla MOTs. 4.4% of tests at 10–15 years failed on brakes, against 1.4% at 0–3 years.
On the test drive, the car should stop straight without pulling or juddering, and the handbrake should hold it on a slope. Look through the wheels for scored or heavily lipped discs.
4. Suspension
Recorded in 16.3% of failed Mercedes-Benz Cla MOTs. Rare on young cars, but 8.2% of tests at 10–15 years failed on suspension.
Listen for knocks over bumps and speed humps, and check the car sits level. Push down on each corner: it should settle rather than keep bouncing.
5. Windscreen and wipers
Recorded in 14.4% of failed Mercedes-Benz Cla MOTs.
Look for windscreen chips and cracks in the driver’s line of sight, and check the wipers clear the screen and the washers work.
Check the car’s own MOT history. Averages describe the model, not the car in front of you. Look up its registration for past failures, advisories that were never fixed, and gaps or dips in the recorded mileage.
Ask for the service history. Invoices show what was done and when; a stamp alone shows less. See how to check Mercedes-Benz service history and what a service history check can tell you.
Related Mercedes-Benz models
- Mercedes-Benz E-Class — 83.3% pass rate
- Mercedes-Benz Gla — 89.4% pass rate
- Mercedes-Benz GLC — 91.1% pass rate
- Mercedes-Benz Vito — 75.2% pass rate
- Mercedes-Benz B-Class — 79.0% pass rate
- Mercedes-Benz SLK — 78.9% pass rate
Frequently asked questions
- What is the MOT pass rate for the Mercedes-Benz Cla?
- 87.2% of Mercedes-Benz Cla MOT tests pass, based on 128,314 tests in the DVSA anonymised MOT tests and results dataset.
- What are the most common MOT failures for the Mercedes-Benz Cla?
- The most common reason the Mercedes-Benz Cla fails its MOT is tyres — present in 49.0% of failed tests, most often logged as "Tread depth below requirements of 1.6mm".
- What are the common problems with the Mercedes-Benz Cla?
- Going by its MOT results, the most common problem areas on the Mercedes-Benz Cla are tyres; lights and electrics; brakes.
- What should I check when buying a used Mercedes-Benz Cla?
- Start with the areas it most often fails its MOT on: tyres; lights and electrics; brakes; suspension; windscreen and wipers. Then check the specific car's MOT history by registration for failures, advisories and mileage, and ask the seller for service invoices.
- Does this show the Mercedes-Benz Cla's service history?
- No — this is MOT test data, which covers roadworthiness, not servicing. A service history is a separate record of maintenance work, which a specific car only has if its owner has kept it. See the Mercedes-Benz service history guide for how to check and keep one.