Smart Forfour Passion Semi-auto MOT Pass Rate
Overall pass rate across all manufacture years, based on 7,014 real MOT test results. Failure rate: 33.3%.
Data from official DVSA MOT testing records
Smart Forfour Passion Semi-auto MOT Reliability Overview
The Smart Forfour Passion Semi-auto is a less common vehicle in the UK, with 7,014 MOT test results recorded in our database spanning 4 manufacture years. It has an overall MOT pass rate of 66.7% and a failure rate of 33.3%, which is slightly above the UK average of approximately 37%.
Based on this data, the Smart Forfour Passion Semi-auto earns a "Good" reliability rating. The average Smart Forfour Passion Semi-auto presents for MOT with approximately 64,724 miles on the clock. Manufacture year matters: 2007 models achieve the highest pass rate at 71.4%, while 2004 models have the lowest at 62.6%. This 8.8 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Smart Forfour Passion Semi-auto is Brakes, affecting 24.9% 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 Lamps, Reflectors and Electrical Equipment at 21.5%. Tyres rounds out the top three at 18.4%. 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
Tracking how each manufacture year's MOT pass rate changes as the car ages. Showing 3 vintages — click year chips to highlight.
Multi-line chart showing how different Smart Forfour Passion Semi-auto vintages degrade over time, from age 3 to 20 years.
Only vintages with 100+ tests in at least 3 different test years are shown. Fleet average is the UK-wide pass rate for all cars at each age.
📉 How Age Affects Reliability
MOT failure rate by vehicle age for the Smart Forfour Passion Semi-auto. The dashed red line marks when the manufacturer warranty typically expires (3 years).
Line chart showing MOT failure rate by vehicle age from 3 to 18 years, with warranty expiry marked at 3 years.
💡 What does the warranty cliff mean?
The Smart Forfour Passion Semi-auto sees a significant jump in MOT failures after the warranty period. Failure rate increases by 77% once warranty cover ends. Budget for increased maintenance costs from year 4 onwards. Peak failure occurs at age 16 (41.9% fail rate).
Note: pass rates may improve for very old vehicles due to survivorship bias — only well-maintained cars remain on the road.
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 | 36.4% | 2,549 |
| 2 | Brakes | 27.5% | 1,926 |
| 3 | Tyres | 20.5% | 1,435 |
| 4 | Suspension | 15.2% | 1,069 |
| 5 | Driver's View Of The Road | 9.8% | 690 |
| 6 | Visibility | 2.5% | 172 |
| 7 | Steering | 2.3% | 164 |
| 8 | Body, Chassis, Structure | 1.8% | 129 |
| 9 | Noise, Emissions And Leaks | 1.5% | 105 |
| 10 | Non-component Advisories | 1.5% | 104 |
| 11 | Road Wheels | 1.3% | 92 |
| 12 | Body, Structure And General Items | 1.3% | 88 |
| 13 | Exhaust, Fuel And Emissions | 1.2% | 84 |
| 14 | Registration Plates And Vin | 1.1% | 75 |
Failures per 10,000 Miles
avg. 64,724 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 | 5.62 | 36.4% | 2,549 |
| Brakes | 4.24 | 27.5% | 1,926 |
| Tyres | 3.16 | 20.5% | 1,435 |
| Suspension | 2.35 | 15.2% | 1,069 |
| Visibility | 1.90 | 12.3% | 862 |
| Body & Structure | 0.47 | 3.1% | 217 |
| Steering | 0.36 | 2.3% | 164 |
| Noise, emissions and leaks | 0.23 | 1.5% | 105 |
| Non-component advisories | 0.23 | 1.5% | 104 |
| Wheels | 0.20 | 1.3% | 92 |
| Emissions & Exhaust | 0.19 | 1.2% | 84 |
| Registration Plates and VIN | 0.17 | 1.1% | 75 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Smart Forfour Passion Semi-auto has 64,724 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 Smart Forfour Passion Semi-auto has a mileage-adjusted failure rate of 5.14% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Smart Forfour Passion Semi-auto MOT Data
The Smart Forfour Passion Semi-auto is a less common vehicle in the UK, with 7,014 MOT test results recorded in our database spanning 4 manufacture years. It has an overall MOT pass rate of 66.7% and a failure rate of 33.3%, which is slightly above the UK average of approximately 37%.
For Smart Forfour Passion Semi-auto owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on brakes and lamps, reflectors and electrical equipment 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 Forfour Passion Semi-auto is likely to perform.
Brakes — 24.9% of failures
Brakes issues account for 24.9% of MOT failures on the Smart Forfour Passion Semi-auto. 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).
Lamps, Reflectors and Electrical Equipment — 21.5% of failures
Lamps, Reflectors and Electrical Equipment issues account for 21.5% of MOT failures on the Smart Forfour Passion Semi-auto. 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.
Tyres — 18.4% of failures
Tyres issues account for 18.4% of MOT failures on the Smart Forfour Passion Semi-auto. 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 Smart Forfour Passion Semi-auto?
Based on 7,014 MOT tests in our database, the Smart Forfour Passion Semi-auto has an overall pass rate of 66.7% (33.3% fail rate).
What are the most common MOT failures on a Smart Forfour Passion Semi-auto?
The top 3 reasons a Smart Forfour Passion Semi-auto fails its MOT are: 1. Brakes (24.9%), 2. Lamps, Reflectors and Electrical Equipment (21.5%), 3. Tyres (18.4%). Check these areas before booking your MOT.
Is the Smart Forfour Passion Semi-auto reliable?
With a 33.3% MOT failure rate, the Forfour Passion Semi-auto is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Smart Forfour Passion Semi-auto?
Based on failure data, focus on: Brakes (24.9%); Lamps, Reflectors and Electrical Equipment (21.5%); Tyres (18.4%). 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.