Porsche Cayman S S-a MOT Pass Rate
Overall pass rate across all manufacture years, based on 1,230 real MOT test results. Failure rate: 5.4%.
Data from official DVSA MOT testing records
Porsche Cayman S S-a MOT Reliability Overview
The Porsche Cayman S S-a is a niche vehicle in the UK, with 1,230 MOT test results recorded in our database spanning 4 manufacture years. It has an overall MOT pass rate of 94.6% and a failure rate of 5.4%, which is well above the UK average of approximately 37%.
Based on this data, the Porsche Cayman S S-a earns a "Excellent" reliability rating. The average Porsche Cayman S S-a presents for MOT with approximately 36,863 miles on the clock. Manufacture year matters: 2013 models achieve the highest pass rate at 95.4%, while 2012 models have the lowest at 87.5%. This 7.9 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Porsche Cayman S S-a is Tyres, affecting 5.4% of all tests. 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. The second most common issue is Brakes at 2.4%. Suspension rounds out the top three at 1.5%. 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
📉 How Age Affects Reliability
MOT failure rate by vehicle age for the Porsche Cayman S S-a. 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 11 years, with warranty expiry marked at 3 years.
💡 What does the warranty cliff mean?
The Porsche Cayman S S-a actually sees a 47% decrease in failure rate after the warranty period. This is likely due to survivorship bias — unreliable cars are already off the road by this age. Peak failure occurs at age 3 (8.7% 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 | Tyres | 5.4% | 67 |
| 2 | Brakes | 2.4% | 30 |
| 3 | Lamps, Reflectors And Electrical Equipment | 2.2% | 27 |
| 4 | Suspension | 1.5% | 18 |
| 5 | Registration Plates And Vin | 0.7% | 8 |
| 6 | Visibility | 0.5% | 6 |
| 7 | Driver's View Of The Road | 0.4% | 5 |
| 8 | Non-component Advisories | 0.2% | 2 |
| 9 | Steering | 0.2% | 2 |
| 10 | Identification Of The Vehicle | 0.1% | 1 |
| 11 | Seat Belts And Supplementary Restraint Systems | 0.1% | 1 |
Failures per 10,000 Miles
avg. 36,863 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 |
|---|---|---|---|
| Tyres | 1.48 | 5.4% | 67 |
| Brakes | 0.66 | 2.4% | 30 |
| Lamps & Electrical | 0.59 | 2.2% | 27 |
| Suspension | 0.40 | 1.5% | 18 |
| Visibility | 0.24 | 0.9% | 11 |
| Registration Plates and VIN | 0.18 | 0.7% | 8 |
| Non-component advisories | 0.04 | 0.2% | 2 |
| Steering | 0.04 | 0.2% | 2 |
| Identification of the vehicle | 0.02 | 0.1% | 1 |
| Seat Belts | 0.02 | 0.1% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Porsche Cayman S S-a has 36,863 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 Porsche Cayman S S-a has a mileage-adjusted failure rate of 1.46% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Porsche Cayman S S-a MOT Data
The Porsche Cayman S S-a is a niche vehicle in the UK, with 1,230 MOT test results recorded in our database spanning 4 manufacture years. It has an overall MOT pass rate of 94.6% and a failure rate of 5.4%, which is well above the UK average of approximately 37%.
For Porsche Cayman S S-a owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on tyres and brakes 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 Cayman S S-a is likely to perform.
Tyres — 5.4% of failures
Tyres issues account for 5.4% of MOT failures on the Porsche Cayman S S-a. 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.
Brakes — 2.4% of failures
Brakes issues account for 2.4% of MOT failures on the Porsche Cayman S S-a. 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).
Suspension — 1.5% of failures
Suspension issues account for 1.5% of MOT failures on the Porsche Cayman S S-a. 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.
Frequently Asked Questions
What is the MOT pass rate for the Porsche Cayman S S-a?
Based on 1,230 MOT tests in our database, the Porsche Cayman S S-a has an overall pass rate of 94.6% (5.4% fail rate).
What are the most common MOT failures on a Porsche Cayman S S-a?
The top 3 reasons a Porsche Cayman S S-a fails its MOT are: 1. Tyres (5.4%), 2. Brakes (2.4%), 3. Suspension (1.5%). Check these areas before booking your MOT.
Is the Porsche Cayman S S-a reliable?
With a 5.4% MOT failure rate, the Cayman S S-a is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Porsche Cayman S S-a?
Based on failure data, focus on: Tyres (5.4%); Brakes (2.4%); Suspension (1.5%). 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.