MOT performance
Mercedes-Benz CLS vs Volvo V90: MOT pass rates compared
In 2023–2024, 74.4% of 48,848 Mercedes-Benz CLS MOT tests and 84.7% of 30,109 Volvo V90 tests passed first time — 10.3 points in favour of the Volvo V90. Once age, mileage and fuel are allowed for, the Mercedes-Benz CLS fails less often than the Volvo V90: 0.80× against 0.85× the national rate for comparable cars.
48,848 Mercedes-Benz CLS and 30,109 Volvo V90 MOT tests, 2023–2024
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| Figure | Value | Basis |
|---|---|---|
| Mercedes-Benz CLS: first-time pass rate | 74.4% | ±0.4 pts (95%), n = 48,848 |
| Volvo V90: first-time pass rate | 84.7% | ±0.4 pts (95%), n = 30,109 |
| Mercedes-Benz CLS: failures vs similar cars | -20% | same age, mileage and fuel = 1.00 |
| Volvo V90: failures vs similar cars | -15% | same age, mileage and fuel = 1.00 |
| Mercedes-Benz CLS: dangerous defect | 10.6% | n = 48,848 |
| Volvo V90: dangerous defect | 7.5% | n = 30,109 |
| Average age at test | 10.6 vs 4.5 years | Mercedes-Benz CLS vs Volvo V90 |
Why the raw pass rates can mislead
The Mercedes-Benz CLS was tested at an older average age (10.6 years against 4.5), and older cars fail more often whatever they are. That is why the table above also shows failures against cars of the same age, mileage and fuel: it compares the models, not their fleets. Here the adjustment reverses the raw result: the Mercedes-Benz CLS has the lower pass rate but fails less often than comparable cars.
Failure areas side by side
Share of MOT tests that failed on each area, and in brackets how that compares with cars of the same age, mileage and fuel (1.00 = national average). The clearest difference is body, chassis and structure, where the Volvo V90 fails 7.9 times as often on an adjusted basis.
| Area | Mercedes-Benz CLS | Volvo V90 |
|---|---|---|
| Brakes | 6.3% (-22%) | 4.1% (+14%) |
| Steering | 1.2% (-50%) | 0.4% (+6%) |
| Suspension | 8.0% (-28%) | 1.1% (-55%) |
| Tyres | 10.0% (+41%) | 6.8% (+17%) |
| Road wheels | 1.6% (+233%) | 0.3% (+2%) |
| Lights, reflectors and electrical | 5.3% (-58%) | 2.3% (-53%) |
| Body, chassis and structure | 1.0% (-77%) | 1.6% (+80%) |
| Driver's view of the road | 2.1% (-58%) | 1.3% (-61%) |
| Noise, emissions and leaks | 3.1% (-9%) | 0.5% (-67%) |
| Seat belts and airbags | 0.4% (-68%) | 0.1% (-72%) |
| Registration plates and VIN | 0.5% (+22%) | 0.2% (-18%) |
Pass rate at the same age
Comparing cars of the same age removes most of the fleet-age effect from the raw rates.
| Age at test | Mercedes-Benz CLS | Volvo V90 |
|---|---|---|
| 3-4 years | 82.3% (n = 2,717) | 85.7% (n = 13,844) |
| 5-6 years | 82.0% (n = 5,279) | 83.8% (n = 11,357) |
| 7-8 years | 80.5% (n = 9,268) | 80.7% (n = 1,634) |
| 16+ years | 67.7% (n = 8,459) | 70.3% (n = 279) |
Most common failure item
- Mercedes-Benz CLS · condition: has ply or cords exposed (3.24% of tests)
- Volvo V90 · brake pads: less than 1.5 mm thick (3.35% of tests)
MOT results reflect how cars are maintained as well as how they are built, so a gap between two models is a difference in test performance, not proof that one is more reliable. For one car, its own MOT history says more than any average.
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About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.