TOYOTA SIENTA (2020)
Running costs, reliability data, and common problems from 47 real MOT tests.
Annual Cost
£1,587
£132/month
MOT Pass Rate
91%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 12-25
1490cc Hybrid
Great Choice
91% pass rate, £1587/year to run. 9 points above average.
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Annual Running Costs
~42 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 9 points above the national average of 82%. It also outperforms the TOYOTA brand average of 84%.
At 6 years old, 91% of TOYOTA SIENTAs from 2020 passed their MOT first time in 2026. That's based on 47 tests across the UK. The average mileage at this age is 40,657 miles.
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How Does It Compare?
Mileage Analysis
40,657
Average miles
44,400
Expected for age
The average 2020 TOYOTA SIENTA has 40,657 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
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Best Year to Buy?
The most reliable year is the 2018 model with a 100% MOT pass rate, while the 2016 model has the lowest at 88%. The 2020 sits between the two at 91%.
TOYOTA SIENTA by Year
Similar Cars to Consider
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About the 2020 TOYOTA SIENTA
The 2020 TOYOTA SIENTA is a small family car with a 1490cc hybrid engine. 47 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2020, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 40,657 miles at 6 years old, TOYOTA SIENTA owners drive about as much as the UK average.
2020 TOYOTA SIENTA Fuel Costs
The 1490cc hybrid engine offers a reasonable balance between performance and economy. Expect around 42 mpg in mixed driving, which works out to roughly £1,137 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 2020 TOYOTA SIENTA?
Total estimated annual running cost is £1,587 (£132/month), broken down as £1137 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 91% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
TOYOTA SIENTA Reliability Trend
Newer TOYOTA SIENTAs show better MOT pass rates than older ones, with an average improvement of 11 percentage points.
Buying a Used 2020 TOYOTA SIENTA
At 6 years old, the TOYOTA SIENTA offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2018 model has the highest pass rate at 100%. Note: with only 47 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2020 TOYOTA SIENTA's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 6 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 2020 TOYOTA SIENTA stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| TOYOTA SIENTA(2020) | 91% | £1137 | £195 | Grp 12-25 | £1587 |
| TOYOTA YARIS(2018) | 91% | £1137 | £190 | Grp 8-20 | £1582-£5 |
| MINI COOPER S(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£5 |
| TOYOTA C-HR(2018) | 90% | £1327 | £190 | Grp 18-32 | £1772+£185 |
| VOLVO XC40(2021) | 93% | £1137 | £190 | Grp 12-25 | £1582-£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 Toyota Models
Explore other Toyota cars or similar models in the same category.
TOYOTA YARIS
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TOYOTA AYGO
2015 · 998cc Petrol
TOYOTA PRIUS
2019 · 1797cc Petrol
TOYOTA YARIS
2018 · 1349cc Hybrid
MINI COOPER S
2019 · 1499cc Hybrid
TOYOTA C-HR
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