PORSCHE CAYMAN (2021)
Running costs, reliability data, and common problems from 1,230 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
97%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 25-38
2497cc Petrol
Great Choice
97% pass rate, £2042/year to run. 15 points above average.
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Annual Running Costs
~30 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Excellent reliability. Very few MOT failures. That's 15 points above the national average of 82%. It also outperforms the PORSCHE brand average of 92%.
At 5 years old, 97% of PORSCHE CAYMANs from 2021 passed their MOT first time in 2026. That's based on 1,230 tests across the UK. The average mileage at this age is 16,318 miles.
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How Does It Compare?
Mileage Analysis
16,318
Average miles
37,000
Expected for age
The average 2021 PORSCHE CAYMAN has 16,318 miles on the clock, which is significantly below the expected 37,000 miles for a 5-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.
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Best Year to Buy?
The most reliable year is the 2022 model with a 100% MOT pass rate, while the 2006 model has the lowest at 86%. The 2021 sits between the two at 97%.
PORSCHE CAYMAN by Year
| Year | Pass Rate | Tests | Avg Mileage | |
|---|---|---|---|---|
| 2022 | 100% | 60 | 10,562 mi | |
| 2021 | 97% | 1,230 | 16,318 mi | |
| 2020 | 97% | 1,421 | 17,106 mi | |
| 2019 | 95% | 2,635 | 23,973 mi | |
| 2018 | 96% | 3,611 | 29,634 mi | |
| 2017 | 95% | 2,747 | 32,888 mi | |
| 2016 | 96% | 2,725 | 30,854 mi | |
| 2015 | 96% | 2,774 | 36,438 mi | |
| 2014 | 94% | 2,963 | 49,014 mi | |
| 2013 | 95% | 2,270 | 50,622 mi | |
| 2012 | 96% | 691 | 51,012 mi | |
| 2011 | 92% | 1,167 | 54,736 mi | |
| 2010 | 90% | 1,201 | 67,244 mi | |
| 2009 | 93% | 1,466 | 67,126 mi | |
| 2008 | 89% | 2,312 | 74,137 mi | |
| 2007 | 88% | 3,100 | 77,221 mi | |
| 2006 | 86% | 3,424 | 80,301 mi | |
| 2005 | 89% | 361 | 84,339 mi |
Similar Cars to Consider
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About the 2021 PORSCHE CAYMAN
The 2021 PORSCHE CAYMAN is a luxury with a 2497cc petrol engine. 1,230 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. It ranks in the top 9% of all 2021 cars for reliability.
With an average of 16,318 miles at 5 years old, PORSCHE CAYMAN owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.
2021 PORSCHE CAYMAN Fuel Costs
The 2497cc petrol engine offers a reasonable balance between performance and economy. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 PORSCHE CAYMAN?
Total estimated annual running cost is £2,042 (£170/month), broken down as £1592 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 97% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
PORSCHE CAYMAN Reliability Trend
Newer PORSCHE CAYMANs show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Buying a Used 2021 PORSCHE CAYMAN
At 5 years old, the PORSCHE CAYMAN offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2022 model has the highest pass rate at 100%.
Common Issues to Watch For
Based on the 2021 PORSCHE CAYMAN's fuel type, age, and engine size, these are the most likely problem areas to check.
Oil Consumption
Low riskLarger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2021 PORSCHE CAYMAN stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| PORSCHE CAYMAN(2021) | 97% | £1592 | £195 | Grp 25-38 | £2042 |
| VOLVO XC40(2020) | 93% | £1327 | £190 | Grp 18-32 | £1772-£270 |
| FORD RANGER(2021) | 90% | £1592 | £190 | Grp 25-38 | £2037-£5 |
| MERCEDES GLC(2019) | 93% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| JAGUAR F-PACE(2019) | 91% | £1327 | £190 | Grp 18-32 | £1772-£270 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
Related Porsche Models
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