MOT performance
SEAT Leon vs Citroen C4: MOT pass rates compared
In 2023–2024, 76.7% of 374,342 SEAT Leon MOT tests and 63.3% of 364,993 Citroen C4 tests passed first time — 13.4 points in favour of the SEAT Leon. Once age, mileage and fuel are allowed for, the SEAT Leon fails less often than the Citroen C4: 0.86× against 1.33× the national rate for comparable cars.
374,342 SEAT Leon and 364,993 Citroen C4 MOT tests, 2023–2024
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| Figure | Value | Basis |
|---|---|---|
| SEAT Leon: first-time pass rate | 76.7% | ±0.1 pts (95%), n = 374,342 |
| Citroen C4: first-time pass rate | 63.3% | ±0.2 pts (95%), n = 364,993 |
| SEAT Leon: failures vs similar cars | -14% | same age, mileage and fuel = 1.00 |
| Citroen C4: failures vs similar cars | +33% | same age, mileage and fuel = 1.00 |
| SEAT Leon: dangerous defect | 7.9% | n = 374,342 |
| Citroen C4: dangerous defect | 10.2% | n = 364,993 |
| Average age at test | 8 vs 8.7 years | SEAT Leon vs Citroen C4 |
Why the raw pass rates can mislead
The Citroen C4 was tested at an older average age (8.7 years against 8), 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.
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 steering, where the Citroen C4 fails 6.4 times as often on an adjusted basis.
| Area | SEAT Leon | Citroen C4 |
|---|---|---|
| Brakes | 5.4% (-14%) | 7.9% (+24%) |
| Steering | 0.5% (-72%) | 3.2% (+79%) |
| Suspension | 7.3% (-8%) | 10.3% (+23%) |
| Tyres | 6.9% (+1%) | 7.9% (+17%) |
| Road wheels | 0.4% (+4%) | 0.4% (-1%) |
| Lights, reflectors and electrical | 6.2% (-38%) | 16.4% (+66%) |
| Body, chassis and structure | 2.2% (-22%) | 7.5% (+155%) |
| Driver's view of the road | 3.7% (-16%) | 6.0% (+41%) |
| Noise, emissions and leaks | 2.7% (-3%) | 2.8% (+5%) |
| Seat belts and airbags | 0.8% (-13%) | 1.1% (+27%) |
| Registration plates and VIN | 0.4% (+10%) | 0.2% (-28%) |
| Speedometer and driving controls | 0.0% (-57%) | 0.0% (-27%) |
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 | SEAT Leon | Citroen C4 |
|---|---|---|
| 3-4 years | 84.8% (n = 66,454) | 81.5% (n = 29,559) |
| 5-6 years | 81.7% (n = 73,068) | 73.1% (n = 60,984) |
| 7-8 years | 80.3% (n = 67,995) | 65.5% (n = 103,703) |
| 9-10 years | 75.6% (n = 58,046) | 58.4% (n = 67,565) |
| 11-12 years | 66.5% (n = 31,037) | 54.5% (n = 33,016) |
| 13-15 years | 60.6% (n = 32,346) | 48.4% (n = 42,844) |
| 16+ years | 58.2% (n = 26,121) | 48.9% (n = 18,917) |
Most common failure item
- SEAT Leon · coil spring: fractured or broken (2.87% of tests)
- Citroen C4 · joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt (5.51% 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.