Kia Stonic MOT Failures
An analysis of 2,030 real DVSA MOT tests on the Kia Stonic — what fails, how often, and how that compares to every other car on UK roads. Generations covered: YB (2017–2023).
Where the Kia Stonic fails its MOT
The single biggest MOT failure point on the Kia Stonic is track rod ends worn — this model is 9.9 times more likely to fail on this item than the average car on UK roads. That makes it worth watching for anyone buying or owning this model. Across 2,030 MOT tests, 3.03% of all Kia Stonic tests recorded this as a failure.
Steering faults include worn track rod ends, power steering leaks, and rack wear. These are safety-critical — any play in the steering should be investigated immediately.
The failures span 2 categories: Steering, Lights & Electrics. If you're inspecting a Kia Stonic before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The Kia Stonic's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
The standout failure at this mileage is track rod ends worn at 9.9x the fleet average.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
The standout failure at this mileage is headlight fault at 6.5x the fleet average.
The shift from track rod ends worn at lower mileages to headlight fault at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.
Known issues beyond the MOT
An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Kia Stonic specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Steering ball joint excessive wear (1.0 Petrol) Major
The steering ball joints on 1.0 petrol variants show premature wear, particularly affecting early production models. Affects YB; typical independent garage repair cost is £150–£250.
Brake binding Major
Brake calipers on the Stonic can seize or bind, causing the brake pads to maintain contact with the disc even when the pedal is not applied. Affects YB; typical independent garage repair cost is £100–£180.
Dual-mass flywheel failure (Diesel) Major
The dual-mass flywheel (DMF) on diesel variants can fail prematurely, causing vibration, noise, and difficulty engaging gears. Affects YB; typical independent garage repair cost is £800–£1,200.
DPF blockage and regeneration issues (Diesel) Major
The diesel particulate filter (DPF) on diesel variants can block if the car is used primarily for short journeys at low speeds. Affects YB; typical independent garage repair cost is £150–£400.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Kia Stonic common problems breakdown.
What to check before buying a Kia Stonic
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Kia Stonic:
Steering — check for track rod ends worn. Lights & Electrics — check for headlight fault.
Beyond the MOT items, ask specifically about steering ball joint excessive wear and brake binding. These won't show up on a standard MOT but can be expensive to fix — repairs start from £150. A specialist pre-purchase inspection is worth the investment on this model.
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.
Looking at a specific Kia Stonic?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
Kia Stonic MOT FAQs
What are the most common MOT failures on a Kia Stonic?
Based on 2,030 DVSA MOT tests, the most common failure is track rod ends worn — at 10x the national fleet average. Other frequent failures include headlight fault.
Is the Kia Stonic reliable based on MOT data?
The Kia Stonic has 2 MOT failure categories above the fleet average. Specialists also flag steering ball joint excessive wear as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
The most common high-mileage failures include track rod ends worn, headlight fault.
How do I check a Kia Stonic's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.