Toyota Sienta MOT Pass Rate
Overall pass rate across all manufacture years, based on 1,070 real MOT test results. Failure rate: 13.4%.
Data from official DVSA MOT testing records
Toyota Sienta MOT Reliability Overview
The Toyota Sienta is a niche vehicle in the UK, with 1,070 MOT test results recorded in our database spanning 11 manufacture years. It has an overall MOT pass rate of 86.6% and a failure rate of 13.4%, which is well above the UK average of approximately 37%.
Based on this data, the Toyota Sienta earns a "Excellent" reliability rating. The average Toyota Sienta presents for MOT with approximately 60,939 miles on the clock. Manufacture year matters: 2018 models achieve the highest pass rate at 98.4%, while 2004 models have the lowest at 76.5%. This 21.9 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Toyota Sienta is Lamps, reflectors and electrical equipment, affecting 11.0% of all tests. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. The second most common issue is Suspension at 8.7%. Tyres rounds out the top three at 6.7%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
Best Year to Buy
📈 How Each Vintage Ages
Pass Rate by Manufacture Year
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Lamps, Reflectors And Electrical Equipment | 14.4% | 154 |
| 2 | Suspension | 8.7% | 93 |
| 3 | Tyres | 6.7% | 72 |
| 4 | Brakes | 3.2% | 34 |
| 5 | Visibility | 2.3% | 25 |
| 6 | Non-component Advisories | 1.4% | 15 |
| 7 | Body, Chassis, Structure | 1.4% | 15 |
| 8 | Noise, Emissions And Leaks | 0.7% | 7 |
| 9 | Driver's View Of The Road | 0.6% | 6 |
| 10 | Registration Plates And Vin | 0.4% | 4 |
| 11 | Seat Belts And Supplementary Restraint Systems | 0.3% | 3 |
| 12 | Road Wheels | 0.3% | 3 |
| 13 | Body, Structure And General Items | 0.1% | 1 |
| 14 | Steering | 0.1% | 1 |
Failures per 10,000 Miles
avg. 60,939 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Lamps & Electrical | 2.36 | 14.4% | 154 |
| Suspension | 1.43 | 8.7% | 93 |
| Tyres | 1.10 | 6.7% | 72 |
| Brakes | 0.52 | 3.2% | 34 |
| Visibility | 0.47 | 2.9% | 31 |
| Body & Structure | 0.25 | 1.5% | 16 |
| Non-component advisories | 0.23 | 1.4% | 15 |
| Noise, emissions and leaks | 0.11 | 0.7% | 7 |
| Registration Plates and VIN | 0.06 | 0.4% | 4 |
| Seat Belts | 0.05 | 0.3% | 3 |
| Wheels | 0.05 | 0.3% | 3 |
| Steering | 0.02 | 0.1% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Toyota Sienta has 60,939 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The Toyota Sienta has a mileage-adjusted failure rate of 2.20% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Toyota Sienta MOT Data
The Toyota Sienta is a niche vehicle in the UK, with 1,070 MOT test results recorded in our database spanning 11 manufacture years. It has an overall MOT pass rate of 86.6% and a failure rate of 13.4%, which is well above the UK average of approximately 37%.
For Toyota Sienta owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on lamps, reflectors and electrical equipment and suspension for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific Sienta is likely to perform.
Lamps, reflectors and electrical equipment — 11.0% of failures
Lamps, reflectors and electrical equipment issues account for 11.0% of MOT failures on the Toyota Sienta. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Suspension — 8.7% of failures
Suspension issues account for 8.7% of MOT failures on the Toyota Sienta. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Tyres — 6.7% of failures
Tyres issues account for 6.7% of MOT failures on the Toyota Sienta. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Frequently Asked Questions
What is the MOT pass rate for the Toyota Sienta?
Based on 1,070 MOT tests in our database, the Toyota Sienta has an overall pass rate of 86.6% (13.4% fail rate).
What are the most common MOT failures on a Toyota Sienta?
The top 3 reasons a Toyota Sienta fails its MOT are: 1. Lamps, reflectors and electrical equipment (11.0%), 2. Suspension (8.7%), 3. Tyres (6.7%). Check these areas before booking your MOT.
Is the Toyota Sienta reliable?
With a 13.4% MOT failure rate, the Sienta is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Toyota Sienta?
Based on failure data, focus on: Lamps, reflectors and electrical equipment (11.0%); Suspension (8.7%); Tyres (6.7%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.