Kia Stonic
Reliability, running costs, and MOT data across 5 years from 31,430 real MOT tests.
Avg Pass Rate
92%
Total Tests
31,430
Best Year
2021 (97%)
Years Covered
5
How reliable is the Kia Stonic?
Kia Stonic by Year
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About the Kia Stonic
The Kia Stonic has been tested 31,430 times in 2024 MOT data across 5 model years (2017 to 2021), with an average pass rate of 92%. That's comfortably above the national average of 82%, making it a reliable choice. Available as diesel and petrol.
Best and Worst Years
The 2021 model is the most reliable with a 97% pass rate from 250 tests. The 2017 model has the lowest at 89%. The 8 point spread between years means reliability varies somewhat, but no year is dramatically different.
Reliability Trend
Newer KIA STONICs show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Mileage Across Years
The oldest model in our data (2017) averages 45,840 miles, while the newest (2021) averages 18,874 miles.
Compared to the Kia brand average of 86%, the Stonic performs 6 points better, making it one of the more reliable options in the Kia range.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.