TOYOTA SIENTA (2018)
Running costs, reliability data, and common problems from 99 real MOT tests.
Annual Cost
£1,587
£132/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 12-25
1499cc Petrol
Great Choice
100% pass rate, £1587/year to run. 18 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 18 points above the national average of 82%. It also outperforms the TOYOTA brand average of 84%.
At 8 years old, 100% of TOYOTA SIENTAs from 2018 passed their MOT first time in 2026. That's based on 99 tests across the UK. The average mileage at this age is 34,981 miles.
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Mileage Analysis
34,981
Average miles
59,200
Expected for age
The average 2018 TOYOTA SIENTA has 34,981 miles on the clock, which is below the expected 59,200 miles for a 8-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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TOYOTA SIENTA by Year
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About the 2018 TOYOTA SIENTA
The 2018 TOYOTA SIENTA is a small family car with a 1499cc petrol engine. 99 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 1% of all 2018 cars for reliability.
With an average of 34,981 miles at 8 years old, TOYOTA SIENTA owners tend to use this car less than the typical driver.
2018 TOYOTA SIENTA Fuel Costs
The 1499cc petrol 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 petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2018 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 100% 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 2018 TOYOTA SIENTA
At 8 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. Note: with only 99 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2018 TOYOTA SIENTA's fuel type, age, and engine size, these are the most likely problem areas to check.
Suspension Wear
Medium riskShock absorbers, springs, and anti-roll bar links typically need attention around this age. Listen for clunks over bumps and check for uneven tyre wear.
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 2018 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(2018) | 100% | £1137 | £195 | Grp 12-25 | £1587 |
| VAUXHALL CORSA(2016) | 81% | £1137 | £30 | Grp 8-20 | £1572-£15 |
| FORD FOCUS(2016) | 87% | £1137 | £135 | Grp 12-25 | £1677+£90 |
| NISSAN QASHQAI(2017) | 86% | £955 | £190 | Grp 5-15 | £1550-£37 |
| VAUXHALL ASTRA(2016) | 85% | £955 | £30 | Grp 1-8 | £1390-£197 |
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
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TOYOTA PRIUS
2019 · 1797cc Petrol
VAUXHALL CORSA
2016 · 1398cc Petrol
FORD FOCUS
2016 · 1596cc Petrol
NISSAN QASHQAI
2017 · 1200cc Petrol
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