PORSCHE 911 (2021)
Running costs, reliability data, and common problems from 72 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2981cc Petrol
Great Choice
100% pass rate, £2042/year to run. 18 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 18 points above the national average of 82%. It also outperforms the PORSCHE brand average of 92%.
At 5 years old, 100% of PORSCHE 911s from 2021 passed their MOT first time in 2026. That's based on 72 tests across the UK. The average mileage at this age is 11,708 miles.
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How Does It Compare?
Mileage Analysis
11,708
Average miles
37,000
Expected for age
The average 2021 PORSCHE 911 has 11,708 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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PORSCHE 911 by Year
| Year | Pass Rate | Tests | Avg Mileage | |
|---|---|---|---|---|
| 2021 | 100% | 72 | 11,708 mi | |
| 2020 | 97% | 2,366 | 17,049 mi | |
| 2019 | 97% | 7,188 | 20,907 mi | |
| 2018 | 96% | 7,623 | 18,989 mi | |
| 2017 | 97% | 6,200 | 26,067 mi | |
| 2016 | 97% | 5,524 | 28,111 mi | |
| 2015 | 97% | 4,950 | 32,698 mi | |
| 2014 | 96% | 4,806 | 32,843 mi | |
| 2013 | 96% | 3,535 | 43,937 mi | |
| 2012 | 95% | 4,253 | 50,959 mi | |
| 2011 | 95% | 2,580 | 43,837 mi | |
| 2010 | 94% | 3,656 | 49,709 mi | |
| 2009 | 92% | 3,055 | 59,885 mi | |
| 2008 | 92% | 4,216 | 58,132 mi | |
| 2007 | 90% | 5,366 | 62,566 mi | |
| 2006 | 90% | 6,184 | 70,206 mi | |
| 2005 | 90% | 5,986 | 73,824 mi | |
| 2004 | 88% | 5,191 | 74,425 mi | |
| 2003 | 87% | 5,168 | 82,296 mi | |
| 2002 | 86% | 4,972 | 84,310 mi | |
| 2001 | 88% | 2,885 | 87,628 mi | |
| 2000 | 86% | 2,099 | 90,453 mi | |
| 1999 | 87% | 3,668 | 94,086 mi | |
| 1998 | 85% | 3,337 | 99,008 mi | |
| 1997 | 90% | 2,103 | 76,331 mi | |
| 1996 | 91% | 2,651 | 80,487 mi | |
| 1995 | 89% | 1,831 | 80,965 mi | |
| 1994 | 91% | 1,473 | 95,559 mi | |
| 1993 | 91% | 698 | 89,736 mi | |
| 1992 | 94% | 611 | 81,375 mi | |
| 1991 | 91% | 929 | 81,480 mi | |
| 1990 | 91% | 1,888 | 94,950 mi |
Similar Cars to Consider
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About the 2021 PORSCHE 911
The 2021 PORSCHE 911 is a luxury with a 2981cc petrol engine. 72 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 1% of all 2021 cars for reliability.
With an average of 11,708 miles at 5 years old, PORSCHE 911 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 911 Fuel Costs
The 2981cc petrol engine is on the larger side, so fuel won't be this car's strong point. 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 911?
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 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
PORSCHE 911 Reliability Trend
Newer PORSCHE 911s show better MOT pass rates than older ones, with an average improvement of 6 percentage points.
Buying a Used 2021 PORSCHE 911
At 5 years old, the PORSCHE 911 offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 72 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 PORSCHE 911'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 911 stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| PORSCHE 911(2021) | 100% | £1592 | £195 | Grp 30-42 | £2042 |
| BMW 5 SERIES(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| BMW X3(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| MERCEDES GLC(2019) | 93% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| BMW X5(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
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
Explore other Porsche cars or similar models in the same category.
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PORSCHE CAYENNE
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PORSCHE BOXSTER
2005 · 3197cc Petrol
BMW 5 SERIES
2019 · 2998cc Petrol
BMW X3
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MERCEDES GLC
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