Is the Kia Niro reliable?

On MOT evidence the Kia Niro is well above average. It passes 85.8% of tests once age and mileage are accounted for, against a national average of 72.3%. That figure covers 61% of the national age and mileage range, which is enough to quote but not to rank. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.

What is the most common MOT failure on a Kia Niro?

The item recorded most often is "A tyre seriously damaged", which appears in 24.8% of failed Kia Niro tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a Kia Niro?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 21.1% of all Kia Niro tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Kia Niro usually have at its MOT?

The average odometer reading recorded at test is 52,814 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Which Kia Niro years are the most reliable?

Going by MOT pass rate, Kia Niro cars first registered 2020–2022 do best at 88.0%, and those registered 2014–2016 do worst at 84.0%. But that ordering is mostly age, not build year: almost every model passes less often as it wears, so the newest cars top this list whatever they are. A specific year looking strong here means little on its own; the failure items above, and the individual car's own MOT history, tell you far more.

Does a Kia Niro get harder to pass as it ages?

Yes. At 3 to 5 years old, 88.0% of Kia Niro tests pass. By 9 to 11 years, that falls to 84.0%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

Are most Kia Niro models petrol or diesel?

Of the Kia Niro cars tested, 61% are hybrid, 39% are electric. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

Model reliability file

Kia Niro MOT pass rate & common failures

From 104,555 recorded MOT tests of the Kia Niro, published by DVSA.

Data updated 29 July 2026

Quick answer

The Kia Niro passes 85.8% of MOT tests once results are adjusted for the age and mileage of the cars tested, against a national average of 72.3%. That is well above average. Based on 104,555 tests. Its most commonly recorded failure is tyre seriously damaged, which appears in 24.8% of failed tests. Cars of this model average 52,814 miles on the odometer when tested.

At a glance

Pass rate, adjusted for age and mileage

85.8%national average72.3%unadjusted87.7%range covered61%

The Niro is 13.5 percentage points above the national pass rate once age and mileage are accounted for, which is well above average. The unadjusted figure is 87.7%; the difference is what the age and mileage of this model’s fleet was hiding.

DVSA recorded wording

Most common failure items

Share of failed Kia Niro tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A tyre seriously damaged24.8%
2,295 occurrencesTyre damaged or deteriorated explained
2.A tyre cords visible or damaged23.2%
2,140 occurrencesTyre ply or cord exposed, or the casing separating explained
3.Tyre tread depth not in accordance with the requirements20.6%
1,904 occurrencesTyre worn close to the legal limit explained
4.Wiper blade missing or obviously not clearing the windscreen19.6%
1,810 occurrencesWiper or washer not working properly explained
5.A brake lining or pad worn below 1.5mm3.5%
320 occurrencesBrake drum or shoe worn or contaminated explained
6.Parking brake efficiency below minimum requirement3.4%
310 occurrencesParking brake efficiency too low explained
7.A tyre seriously damaged3.1%
288 occurrencesTyre damaged or deteriorated explained
8.A tyre seriously damaged3.0%
273 occurrencesTyre damaged or deteriorated explained
9.Windscreen washers not working or not providing sufficient fluid to clear the windscreen2.7%
249 occurrencesWiper or washer not working properly explained
10.Service brake efficiency below minimum requirement2.6%
239 occurrencesBraking efficiency below requirement explained

Warnings without a failure

Most common advisories

Share of all Kia Niro tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Tyre tread depth not in accordance with the requirements21.1%
22,064 testsTyre worn close to the legal limit explained
2.A tyre seriously damaged11.9%
12,456 testsTyre damaged or deteriorated explained
3.Brake disc or drum excessively weakened, insecure or fractured6.3%
6,581 testsBrake disc worn, pitted or scored explained
4.Tyre tread depth not in accordance with the requirements3.1%
3,229 testsTyre worn close to the legal limit explained
5.A tyre seriously damaged2.7%
2,834 testsTyre damaged or deteriorated explained
6.Child Seat fitted not allowing full inspection of adult belt2.6%
2,670 tests
7.Nail in tyre1.9%
2,013 tests
8.A brake lining or pad worn below 1.5mm1.3%
1,309 testsBrake drum or shoe worn or contaminated explained

The rest of the record

Everything else recorded on the Kia Niro

The 24 other defects testers recorded on this model, beyond the most common listed above. Each links to what it means and what it takes to put right.

Known faults

Kia Niro common problems, by part and by year

The same failure record read the way a buyer asks the question: which parts wear out on a Niro, when they start, and how each registration year compares — including the steps that mark a generation change.

Niro common problems and results by year

How wear changes the picture

Niro pass rate by age and registration year

How often the Kia Niro passes at each age, with the years those cars were first registered. Tests are from 2025, so a car aged 3 to 5 was first used in 2020–2022.

3–5 yrsreg. 2020–202288%

6–8 yrsreg. 2017–201986%

9–11 yrsreg. 2014–201684%

Read this as an age curve rather than a verdict on particular model years. Nearly every car passes less often as it gets older, so a newer Niro outscoring an older one says more about wear than about how that year’s cars were built. Bands holding too few tests to be meaningful are omitted rather than shown as a rate.

What gets tested

The Niro fleet

Average mileage recorded at test: 52,814
Fuel mix of tested cars: Hybrid61.2%
Electric38.6%

Trim names grouped into this model (23)

Recorded exactly as DVSA holds them. Trim-level names are rolled up so one model is not split across a dozen thin pages.

NIRO 2
NIRO 2 EV
NIRO 2 HEV S-A
NIRO 2 PHEV S-A
NIRO 2 S-A
NIRO 3
NIRO 3 EV
NIRO 3 HEV S-A
NIRO 3 PHEV S- A
NIRO 3 PHEV S-A
NIRO 4 + EV
NIRO 4 EV
NIRO 4 HEV S-A
NIRO 4 PHEV S-A
NIRO CONNECT HEV S-A
NIRO CONNECT PHEV S-A
NIRO EV
NIRO EV 2
NIRO FIRST EDITION EV
NIRO HORIZON EV
NIRO HYBRID
NIRO HYBRID AUTO
NIRO PURE HEV S-A

Check a specific Kia Niro

A model average tells you the pattern. Its own MOT record tells you the car.

Compare within the range

Other Kia models

Kia Sportage — 71.7% adjusted
Kia Picanto — 65.5% adjusted
Kia Ceed — 68.9% adjusted
Kia Rio — 69.0% adjusted
Kia Venga — 64.3% adjusted
Kia Sorento — 72.2% adjusted
All Kia models

Similar test volumes

Compare against other makes

Mazda 3 — 70.6% adjusted, ranked 164
Toyota RAV4 — 79.0% adjusted, ranked 63
Ford C-Max — 68.7% adjusted, ranked 183
Vauxhall Combo — 63.5% adjusted, ranked 236

Common questions

Is the Kia Niro reliable?: On MOT evidence the Kia Niro is well above average. It passes 85.8% of tests once age and mileage are accounted for, against a national average of 72.3%. That figure covers 61% of the national age and mileage range, which is enough to quote but not to rank. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.
What is the most common MOT failure on a Kia Niro?: The item recorded most often is "A tyre seriously damaged", which appears in 24.8% of failed Kia Niro tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a Kia Niro?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 21.1% of all Kia Niro tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Kia Niro usually have at its MOT?: The average odometer reading recorded at test is 52,814 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.
Which Kia Niro years are the most reliable?: Going by MOT pass rate, Kia Niro cars first registered 2020–2022 do best at 88.0%, and those registered 2014–2016 do worst at 84.0%. But that ordering is mostly age, not build year: almost every model passes less often as it wears, so the newest cars top this list whatever they are. A specific year looking strong here means little on its own; the failure items above, and the individual car's own MOT history, tell you far more.
Does a Kia Niro get harder to pass as it ages?: Yes. At 3 to 5 years old, 88.0% of Kia Niro tests pass. By 9 to 11 years, that falls to 84.0%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.
Are most Kia Niro models petrol or diesel?: Of the Kia Niro cars tested, 61% are hybrid, 39% are electric. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. The adjusted rate is directly standardised across twenty-five age and mileage bands and reweighted onto the national distribution, so this model is compared against cars that have lived a similar life rather than against a younger or lighter-used fleet.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.