MOT performance
Nissan Leaf vs Hyundai Ioniq: MOT pass rates compared
In 2023–2024, 80.9% of 81,819 Nissan Leaf MOT tests and 86.4% of 77,698 Hyundai Ioniq tests passed first time — 5.5 points in favour of the Hyundai Ioniq. Once age, mileage and fuel are allowed for, the Hyundai Ioniq fails less often than the Nissan Leaf: 0.99× against 1.13× the national rate for comparable cars.
81,819 Nissan Leaf and 77,698 Hyundai Ioniq MOT tests, 2023–2024
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| Figure | Value | Basis |
|---|---|---|
| Nissan Leaf: first-time pass rate | 80.9% | ±0.3 pts (95%), n = 81,819 |
| Hyundai Ioniq: first-time pass rate | 86.4% | ±0.2 pts (95%), n = 77,698 |
| Nissan Leaf: failures vs similar cars | +13% | same age, mileage and fuel = 1.00 |
| Hyundai Ioniq: failures vs similar cars | -1% | same age, mileage and fuel = 1.00 |
| Nissan Leaf: dangerous defect | 6.0% | n = 81,819 |
| Hyundai Ioniq: dangerous defect | 3.7% | n = 77,698 |
| Average age at test | 5.3 vs 4 years | Nissan Leaf vs Hyundai Ioniq |
Why the raw pass rates can mislead
The Nissan Leaf was tested at an older average age (5.3 years against 4), 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 noise, emissions and leaks, where the Hyundai Ioniq fails 18.5 times as often on an adjusted basis.
| Area | Nissan Leaf | Hyundai Ioniq |
|---|---|---|
| Brakes | 4.1% (+67%) | 2.5% (+68%) |
| Steering | 0.9% (+91%) | 0.1% (-19%) |
| Suspension | 6.1% (+58%) | 0.4% (-70%) |
| Tyres | 6.5% (Same) | 4.6% (-22%) |
| Road wheels | 0.3% (+35%) | 0.1% (-50%) |
| Lights, reflectors and electrical | 3.3% (-19%) | 4.0% (+12%) |
| Body, chassis and structure | 0.3% (-29%) | 0.3% (+35%) |
| Driver's view of the road | 3.7% (+11%) | 3.7% (+23%) |
| Noise, emissions and leaks | 0.0% (-91%) | 0.4% (+63%) |
| Seat belts and airbags | 0.3% (+20%) | 0.1% (-26%) |
| Registration plates and VIN | 0.1% (-34%) | 0.1% (-44%) |
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 | Nissan Leaf | Hyundai Ioniq |
|---|---|---|
| 3-4 years | 88.7% (n = 24,268) | 87.8% (n = 35,891) |
| 5-6 years | 82.3% (n = 17,926) | 85.9% (n = 25,546) |
| 7-8 years | 71.2% (n = 16,193) | 82.3% (n = 2,744) |
Most common failure item
- Nissan Leaf · ball joint: ball joint excessively worn (3.76% of tests)
- Hyundai Ioniq · wipers: does not clear the windscreen effectively (2.91% 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.