Bentley S1 MOT Pass Rate
Overall pass rate across all manufacture years, based on 44 real MOT test results. Failure rate: 15.9%.
Data from official DVSA MOT testing records
Bentley S1 MOT Reliability Overview
The Bentley S1 is a rare vehicle in the UK, with 44 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 84.1% and a failure rate of 15.9%, which is well above the UK average of approximately 37%.
Based on this data, the Bentley S1 earns a "Excellent" reliability rating. The average Bentley S1 presents for MOT with approximately 51,205 miles on the clock.
The most common MOT failure for the Bentley S1 is Brakes, affecting 11.4% of all tests. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. The second most common issue is Exhaust, Fuel and Emissions at 9.1%. Lamps, Reflectors and Electrical Equipment rounds out the top three at 6.8%. 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
* 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 | Brakes | 18.2% | 8 |
| 2 | Exhaust, Fuel And Emissions | 9.1% | 4 |
| 3 | Lamps, Reflectors And Electrical Equipment | 6.8% | 3 |
| 4 | Seat Belts And Supplementary Restraint Systems | 4.5% | 2 |
| 5 | Suspension | 4.5% | 2 |
| 6 | Body, Structure And General Items | 4.5% | 2 |
| 7 | Driver's View Of The Road | 2.3% | 1 |
| 8 | Steering | 2.3% | 1 |
Failures per 10,000 Miles
avg. 51,205 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 |
|---|---|---|---|
| Brakes | 3.55 | 18.2% | 8 |
| Emissions & Exhaust | 1.78 | 9.1% | 4 |
| Lamps & Electrical | 1.33 | 6.8% | 3 |
| Seat Belts | 0.89 | 4.5% | 2 |
| Suspension | 0.89 | 4.5% | 2 |
| Body & Structure | 0.89 | 4.5% | 2 |
| Visibility | 0.44 | 2.3% | 1 |
| Steering | 0.44 | 2.3% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Bentley S1 has 51,205 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 Bentley S1 has a mileage-adjusted failure rate of 3.11% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Bentley S1 MOT Data
The Bentley S1 is a rare vehicle in the UK, with 44 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 84.1% and a failure rate of 15.9%, which is well above the UK average of approximately 37%.
For Bentley S1 owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on brakes and exhaust, fuel and emissions 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 S1 is likely to perform.
Brakes — 11.4% of failures
Brakes issues account for 11.4% of MOT failures on the Bentley S1. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Exhaust, Fuel and Emissions — 9.1% of failures
Exhaust, Fuel and Emissions issues account for 9.1% of MOT failures on the Bentley S1. Emissions failures occur when exhaust gases exceed legal limits for carbon monoxide (CO), hydrocarbons (HC), or particulate matter (diesel). Common causes include faulty oxygen sensors, clogged catalytic converters, or DPF issues on diesel vehicles. Typical repair costs: £100–1,000+. Pre-MOT check: If the engine management light is on, get it diagnosed before the MOT. For diesel cars, ensure the DPF has completed a regeneration cycle. Regular servicing and using premium fuel before the test can help.
Lamps, Reflectors and Electrical Equipment — 6.8% of failures
Lamps, Reflectors and Electrical Equipment issues account for 6.8% of MOT failures on the Bentley S1. 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.
Frequently Asked Questions
What is the MOT pass rate for the Bentley S1?
Based on 44 (based on limited data) MOT tests in our database, the Bentley S1 has an overall pass rate of 84.1% (15.9% fail rate).
What are the most common MOT failures on a Bentley S1?
The top 3 reasons a Bentley S1 fails its MOT are: 1. Brakes (11.4%), 2. Exhaust, Fuel and Emissions (9.1%), 3. Lamps, Reflectors and Electrical Equipment (6.8%). Check these areas before booking your MOT.
Is the Bentley S1 reliable?
With a 15.9% MOT failure rate, the S1 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Bentley S1?
Based on failure data, focus on: Brakes (11.4%); Exhaust, Fuel and Emissions (9.1%); Lamps, Reflectors and Electrical Equipment (6.8%). 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.