MOT failures by make
Mitsubishi MOT failures for “Exhaust system: has a major leak of exhaust gases”
Mitsubishi cars failed their MOT on “Exhaust system: has a major leak of exhaust gases” in 1.16% of 600,306 tests in 2023–2024 (6,964 tests) — 1.6 times as often as comparable cars of the same age, mileage and fuel, which would have failed on it in about 0.71% of tests. It is the number 14 most common failure item on Mitsubishis.
Data to 2024-12-30 · Page updated 2026-09-28 · Publisher: 73 Auto
- Mitsubishi tests failing on it
- 1.16%
- 6,964 of 600,306 tests, 2023–2024
- Comparable cars
- 0.71%
- national rate at the same age, mileage and fuel
- Observed ÷ expected
- 1.64×
- 73 Auto analysis · rank #14 for Mitsubishi
How unusual this is for the make
Across all MOT failures, Mitsubishis fail 0% less often than comparable cars. On this item the gap is 1.64× wider than that overall level, so it is a genuine Mitsubishi pattern rather than a reflection of how often the make fails in general. It is a major defect in the body, chassis and structure part of the test. Nationally it appears on 0.78% of MOT tests.
Mitsubishi models and “Exhaust system: has a major leak of exhaust gases”
The Mitsubishi Outlander is most affected (2.60× comparable cars); the Mitsubishi Mirage least (0.28×). Not every model follows the make: the pattern is concentrated in some models. Model rows compare with cars of the same age and fuel.
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| Mitsubishi Outlander | 155,926 | 0.48% | 2.60× |
| Mitsubishi ASX | 59,150 | 1.06% | 2.38× |
| Mitsubishi Shogun | 66,822 | 2.64% | 2.32× |
| Mitsubishi L200 | 180,711 | 1.00% | 1.72× |
| Mitsubishi Lancer | 20,993 | 2.03% | 1.10× |
| Mitsubishi Colt | 48,177 | 2.09% | 1.04× |
| Mitsubishi Mirage | 22,358 | 0.14% | 0.28× |
By age at test
The difference is largest at 3-4 years old: 0.06% of Mitsubishi tests against 0.03% for comparable cars.
| Age (years) | Mitsubishi tests | Mitsubishi | Comparable cars |
|---|---|---|---|
| 3-4 | 82,136 | 0.06% | 0.03% |
| 5-6 | 100,009 | 0.07% | 0.08% |
| 7-8 | 99,888 | 0.22% | 0.18% |
| 9-10 | 63,150 | 0.91% | 0.49% |
| 11-12 | 43,767 | 1.85% | 0.88% |
| 13-15 | 69,328 | 2.13% | 1.39% |
| 16+ | 125,314 | 3.00% | 1.84% |
Other Mitsubishi MOT faults that stand out
- Rear fog lamp: not working · 3.06× comparable cars
- Rigid brake pipes: excessively corroded · 2.57× comparable cars
- Component mounting prescribed areas: prescribed area excessively corroded significantly reducing structural strength · 1.59× comparable cars
Limitations
Official data: DVSA's anonymised MOT results (2023–2024), class 4 initial tests, cars at least 2.5 years old. 73 Auto analysis: the comparison rate applies the national rate of this item for each test's own age, mileage band and fuel to the Mitsubishi tests. An MOT result reflects maintenance, mileage and how a car is used as well as its design, so this is not a measure of which make is most reliable. The wording of the defect is DVSA's.
Has this Mitsubishi failed on it before?
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UK number plate or 17-character VIN
Where these figures come from
- Anonymised MOT tests and results (2023 and 2024) — Driver and Vehicle Standards Agency (DVSA). Open Government Licence v3.0.
Figures labelled as 73 Auto estimates are our own analysis of these sources, set out in the methodology and data sources. To report a factual error, see corrections.