PORSCHE 911 CARRERA 4S (2021)
Running costs, reliability data, and common problems from 258 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
97%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2981cc 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 911 CARRERA 4Ss from 2021 passed their MOT first time in 2026. That's based on 258 tests across the UK. The average mileage at this age is 14,894 miles.
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How Does It Compare?
Mileage Analysis
14,894
Average miles
37,000
Expected for age
The average 2021 PORSCHE 911 CARRERA 4S has 14,894 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 CARRERA 4S by Year
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About the 2021 PORSCHE 911 CARRERA 4S
The 2021 PORSCHE 911 CARRERA 4S is a luxury with a 2981cc petrol engine. 258 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It ranks in the top 10% of all 2021 cars for reliability.
With an average of 14,894 miles at 5 years old, PORSCHE 911 CARRERA 4S 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 CARRERA 4S 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 CARRERA 4S?
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.
Buying a Used 2021 PORSCHE 911 CARRERA 4S
At 5 years old, the PORSCHE 911 CARRERA 4S offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.
Common Issues to Watch For
Based on the 2021 PORSCHE 911 CARRERA 4S'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 CARRERA 4S stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| PORSCHE 911 CARRERA 4S(2021) | 97% | £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 911
2018 · 3996cc Petrol
BMW 5 SERIES
2019 · 2998cc Petrol
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MERCEDES GLC
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