2025 MOT results
Kia Optima common problems
The most common reason a Kia Optima fails its MOT is worn brake pads, on 16.3% of its 2,350 failed tests in 2025. Against other cars of the same age, 5 faults stand out, the widest gaps being: a weak or uneven footbrake at 3.9% of failures against 1.6% expected; a worn steering or suspension joint at 6.0% of failures against 2.5% expected; a weak handbrake at 4.5% of failures against 2.2% expected.
- Tests in 2025 10,954 Cars aged three and over
- Failed first time 21.5% 2,350 tests
- Found a dangerous defect 8.8% Unsafe to drive away
- Ended with an advisory 50.3% A problem to watch, not a failure
What fails a Kia Optima MOT
Each bar is the share of failed Kia Optima tests with that defect. Where we can compare it with cars of the same registration years, the marker shows what an average car of those ages records (12 of the 12 items below).
Most common reasons for failure
A test can fail for more than one defect, so shares add up to more than 100%.
| Defect | Share of failed tests |
|---|---|
| Brake pads: less than 1.5 mm thick Brakes | 16.3% |
| Tyres: tread depth below requirements of 1.6mm Tyres | 10.6% |
| Tyres: ply or cords exposed Tyres | 8.1% |
| Malfunction indicator lamp: inoperative or indicates a malfunction Noise, emissions and leaks | 6.3% |
| Tyres: cut in excess of the requirements deep enough to reach the ply or cords Tyres | 6.2% |
| Track rod end: ball joint has excessive play Steering | 6.0% |
| Wipers: does not clear the windscreen effectively Visibility | 5.1% |
| Parking brake efficiency below requirements Brakes | 4.5% |
| Washers: provides insufficient washer liquid Visibility | 4.2% |
| Service brake performance: excessively binding Brakes | 3.9% |
| Headlamp aim: too high Lamps, reflectors and electrical equipment | 3.6% |
| Headlamp: not working on dipped beam Lamps, reflectors and electrical equipment | 3.3% |
Source:DVSA,UK Motoring analysis 2025 Updated
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Worn brake pads
16.3% of failures 8.7% expected 1.9 times as often
Friction material worn under 1.5mm, thinner than the point most manufacturers call the limit.
Look through the wheel spokes at the pad against the disc; wear indicators squeal before they get this far.
-
Tyre worn below the legal limit
10.6% of failures 9.6% expected about as expected
A tyre worn past the 1.6mm legal minimum across the middle three quarters of the tread.
A 20p coin in the main grooves: if the outer band of the coin is visible, the tyre is close to the limit.
-
Tyre worn through to the cords
8.1% of failures 5.2% expected 1.6 times as often
The tyre is worn or damaged far enough to expose the cords underneath, which is a dangerous defect.
Run a hand round the inner and outer walls of each tyre, which is where kerbing shows.
-
Engine management light on
6.3% of failures 5.3% expected somewhat more often
The engine management light is on, or has been disconnected. Either fails the test.
A cheap code reader on the diagnostic socket will say what the car has stored before you pay for a test.
-
Cut tyre
6.2% of failures 6.5% expected about as expected
A cut in the tyre deep or long enough to reach the structure underneath, usually from a kerb or debris.
Run a hand round the inner and outer walls of each tyre, which is where kerbing shows.
-
Worn steering or suspension joint
6.0% of failures 2.5% expected 2.4 times as often
Play in a steering or suspension joint, where a worn ball and socket lets the wheel move where it should not.
A knock at low speed over rough ground, or vague steering, is the usual warning.
Which parts of the car fail
Brakes is the area that most often fails a Kia Optima, on 37.1% of failed tests. That is also where it differs most from cars of the same registration years, which record 19.6%.
Failure categories
DVSA's own sections of the test. The marker is what cars of the same registration years record.
| Defect category | Share of failed tests |
|---|---|
| Brakes | 37.1% |
| Tyres | 31.0% |
| Lamps, reflectors and electrical equipment | 20.1% |
| Suspension | 13.8% |
| Visibility | 13.0% |
| Steering | 8.9% |
| Noise, emissions and leaks | 7.7% |
| Body, chassis, structure | 4.2% |
Source:DVSA,UK Motoring analysis 2025 Updated
What testers warn about
50.3% of Kia Optima tests ended with at least one advisory: a fault the tester found that did not fail the test. On Kia Optimas, these are the items to ask about on a car you are viewing, because they are what the last tester expected to go next.
Most common advisories
Share of all tests, passes included.
| Advisory | Share of tests |
|---|---|
| Tread depth: worn close to legal limit or worn on edge Tyres | 21.8% |
| Brake pads: wearing thin Brakes | 12.0% |
| Brake discs: worn, pitted or scored, but not seriously weakened Brakes | 9.9% |
| Tyres: slightly damaged or cracking or perishing Tyres | 6.0% |
| Brake discs: worn, but not excessively Brakes | 3.1% |
| Registration plates: deteriorated but not likely to be misread Identification of the vehicle | 3.1% |
| Child seat fitted not allowing full inspection of adult belt Non-component advisories | 3.0% |
| Rigid brake pipes: corroded, covered in grease or other material Brakes | 2.8% |
| Service brake performance: binding but not excessively Brakes | 2.6% |
| Engine oil leak, but not excessive Noise, emissions and leaks | 2.3% |
| Nail in tyre Non-component advisories | 2.1% |
| Suspension arms: pin or bush worn but not resulting in excessive movement Suspension | 2.0% |
Source:DVSA,UK Motoring analysis 2025 Updated
Kia Optima problems: common questions
What is the most common problem with a Kia Optima?
Of the faults that fail an MOT, “Brake pads: less than 1.5 mm thick” is the most common: it appears on 16.3% of failed Kia Optima tests. Across categories, brakes is the area that most often fails one, on 37.1% of failed tests.
How often does a Kia Optima fail its MOT?
21.5% of Kia Optima tests in 2025 were not passed first time, from 10,954 tests of cars aged three and over. Allowing for the age and mileage of the cars tested, that gives it a UK Motoring Reliability Score of 52 out of 100, where 50 is as expected.
Does anything fail more often on a Kia Optima than on other cars?
Yes. “Service brake performance: excessively binding” appears on 3.9% of its failures against 1.6% for cars of the same age, and “Track rod end: ball joint has excessive play” appears on 6.0% of its failures against 2.5% for cars of the same age. Where an item is missing from the national figures for a year, we use the smallest share those figures show, so the comparison never overstates the difference.
Are these the same as breakdowns or known faults?
No. These are the items a tester recorded at the MOT, which covers condition and safety: lamps, brakes, tyres, suspension, corrosion and emissions. A gearbox that is unpleasant, an infotainment screen that has died, or a car that will not start on a cold morning are not part of the test, so they are not in these figures.
Where do the figures come from?
Every normal MOT test of a Kia Optima aged three and over in Great Britain in 2025, from DVSA's anonymised MOT results. Retests are excluded, and the same fault on more than one wheel counts once.
Data stories to read next
Data sources and methodology
| Figures | Source | Period | Records | Updated |
|---|---|---|---|---|
| MOT defects and advisories | Anonymised MOT tests and results Driver and Vehicle Standards Agency Derived statistics UK Motoring | 2025 | 10,954 MOT tests | 19 September 2026 |
- Shares for defects are of failed tests; shares for advisories are of all tests. A test can carry several defects, so shares add to more than 100%.
- The expected share is what an average car of the same registration years records, weighted by where this model’s failures fall. Where an item is outside the national figures for a year, the smallest share those figures show is used in its place, which is an upper bound, so the comparison never overstates a model’s problems. No expectation is published where less than 80% of the model’s failures can be compared.
- Great Britain only: DVSA does not run MOT testing in Northern Ireland. Cars under three years old are not tested.
- The descriptions of what each part does are general and the same on every model. Every figure comes from the MOT data.
Contains public sector information licensed under the Open Government Licence v3.0.