KIA STONIC CONNECT MHEV S-A (2021)
Running costs, reliability data, and common problems from 435 real MOT tests.
Annual Cost
£1,405
£117/month
MOT Pass Rate
95%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 1-8
998cc Hybrid
Great Choice
95% pass rate, £1405/year to run. 13 points above average.
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Annual Running Costs
~50 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Excellent reliability. Very few MOT failures. That's 13 points above the national average of 82%. It also outperforms the KIA brand average of 86%.
At 5 years old, 95% of KIA STONIC CONNECT MHEV S-As from 2021 passed their MOT first time in 2026. That's based on 435 tests across the UK. The average mileage at this age is 21,620 miles.
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How Does It Compare?
Mileage Analysis
21,620
Average miles
37,000
Expected for age
The average 2021 KIA STONIC CONNECT MHEV S-A has 21,620 miles on the clock, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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KIA STONIC CONNECT MHEV S-A by Year
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About the 2021 KIA STONIC CONNECT MHEV S-A
The 2021 KIA STONIC CONNECT MHEV S-A is a city car with a 998cc hybrid engine. 435 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. Among all cars from 2021, the average MOT pass rate is 92%, and this model beats that benchmark.
With an average of 21,620 miles at 5 years old, KIA STONIC CONNECT MHEV S-A owners tend to use this car less than the typical driver.
2021 KIA STONIC CONNECT MHEV S-A Fuel Costs
The modest 998cc hybrid engine keeps fuel costs low, which is a real advantage for a city car. Expect around 50 mpg in mixed driving, which works out to roughly £955 per year at current hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2021 KIA STONIC CONNECT MHEV S-A?
Total estimated annual running cost is £1,405 (£117/month), broken down as £955 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2021 KIA STONIC CONNECT MHEV S-A
At 5 years old, the KIA STONIC CONNECT MHEV S-A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.
Common Issues to Watch For
Based on the 2021 KIA STONIC CONNECT MHEV S-A's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 5 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2021 KIA STONIC CONNECT MHEV S-A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| KIA STONIC CONNECT MHEV S-A(2021) | 95% | £955 | £195 | Grp 1-8 | £1405 |
| TOYOTA YARIS(2019) | 93% | £1137 | £190 | Grp 12-25 | £1582+£177 |
| VOLVO XC40(2021) | 93% | £1137 | £190 | Grp 12-25 | £1582+£177 |
| HONDA JAZZ EX I-MMD CVT(2021) | 96% | £1137 | £190 | Grp 12-25 | £1582+£177 |
| FORD PUMA TITANIUM MHEV(2021) | 95% | £955 | £190 | Grp 1-8 | £1400-£5 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
Related Kia Models
Explore other Kia cars or similar models in the same category.
KIA SPORTAGE
2016 · 1700cc Diesel
KIA PICANTO
2018 · 998cc Petrol
KIA CEED
2012 · 1591cc Diesel
TOYOTA YARIS
2019 · 1497cc Hybrid
VOLVO XC40
2021 · 1470cc Hybrid
HONDA JAZZ EX I-MMD CVT
2021 · 1498cc Hybrid
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