TOYOTA SIENTA (2018)
Running costs, common problems, and reliability data based on 99 real MOT tests in 2024.
MOT Pass Rate
100%
Total Tests (2024)
99
Avg Mileage
34,981 mi
Est. Annual Cost
£1,582
Is the 2018 TOYOTA SIENTA reliable?
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 6 years old, 100% of TOYOTA SIENTAs from 2018 passed their MOT first time in 2024. That's based on 99 tests across the UK. The average mileage at this age is 34,981 miles.
How does the 2018 TOYOTA SIENTA compare?
Mileage Analysis
The average 2018 TOYOTA SIENTA has 34,981 miles on the clock, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.
How much does a 2018 TOYOTA SIENTA cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
TOYOTA SIENTA by Year
Checking a specific TOYOTA SIENTA?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
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 2024, 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 6 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 £1,582 (£132/month), broken down as £1137 fuel, £190 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 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. Note: with only 99 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 2018 TOYOTA SIENTA
The TOYOTA SIENTA is actually the most reliable option among similar petrol small family cars from this era. Here are comparable petrol cars with similar engines:
- VAUXHALL CORSA (2016) 81% pass rate (-19%) from 133,045 tests
- FORD FOCUS (2016) 87% pass rate (-13%) from 109,880 tests
- NISSAN QASHQAI (2017) 86% pass rate (-14%) from 100,176 tests
- VAUXHALL ASTRA (2016) 85% pass rate (-15%) from 92,988 tests