FORD MONDEO ST-LINE HEV AUTO (2021)
Running costs, reliability data, and common problems from 321 real MOT tests.
Annual Cost
£1,927
£161/month
MOT Pass Rate
85%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1999cc Hybrid
Solid Option
85% pass rate, £1927/year to run. Close to the national average.
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Annual Running Costs
~36 mpg
Flat rate (post-2017)
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
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%.
At 5 years old, 85% of FORD MONDEO ST-LINE HEV AUTOs from 2021 passed their MOT first time in 2026. That's based on 321 tests across the UK. The average mileage at this age is 35,284 miles.
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How Does It Compare?
Mileage Analysis
35,284
Average miles
37,000
Expected for age
The average 2021 FORD MONDEO ST-LINE HEV AUTO has 35,284 miles on the clock, which is in line with the expected 37,000 miles for a 5-year-old car, suggesting normal everyday use.
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Best Year to Buy?
The most reliable year is the 2020 model with a 86% MOT pass rate, while the 2021 model has the lowest at 85%. Consider a different year if reliability is a priority.
FORD MONDEO ST-LINE HEV AUTO by Year
Similar Cars to Consider
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About the 2021 FORD MONDEO ST-LINE HEV AUTO
The 2021 FORD MONDEO ST-LINE HEV AUTO is a family car with a 1999cc hybrid engine. 321 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It sits in the bottom 92% of 2021 cars for MOT pass rates.
With an average of 35,284 miles at 5 years old, FORD MONDEO ST-LINE HEV AUTO owners drive about as much as the UK average.
2021 FORD MONDEO ST-LINE HEV AUTO Fuel Costs
The 1999cc hybrid engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 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 FORD MONDEO ST-LINE HEV AUTO?
Total estimated annual running cost is £1,927 (£161/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 85% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 FORD MONDEO ST-LINE HEV AUTO
At 5 years old, the FORD MONDEO ST-LINE HEV AUTO 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 FORD MONDEO ST-LINE HEV AUTO'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 FORD MONDEO ST-LINE HEV AUTO stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| FORD MONDEO ST-LINE HEV AUTO(2021) | 85% | £1327 | £195 | Grp 18-32 | £1927 |
| MINI COOPER S(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| LAND ROVER RANGE ROVER SPORT(2019) | 94% | £1327 | £190 | Grp 18-32 | £1772-£155 |
| TOYOTA C-HR(2019) | 92% | £1327 | £190 | Grp 18-32 | £1772-£155 |
| MINI COUNTRYMAN(2019) | 93% | £1137 | £190 | Grp 12-25 | £1582-£345 |
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.
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TOYOTA C-HR
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