Aston Martin DBX (2021)
Estimated running costs and MOT pass rates from 34 MOT tests in 2024.
Annual Cost
£2,413
£201/month
MOT Pass Rate
97%
Excellent
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 35-50
4000cc Petrol
Great Choice
97% pass rate, £2,413/year to run. 15 points above average.
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Annual Running Costs
~30 mpg
Standard rate (from April 2017)
Low estimate due to excellent reliability
Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).
Reliability Verdict
Excellent reliability. Very few MOT failures. That's 15 points above the average of 82% across all models in our data.
97% of MOT tests on Aston Martin DBXs from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 34 tests across the UK, retests included. The average mileage recorded at those tests was 16,258 miles.
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How Does It Compare?
Mileage Analysis
16,258
Average miles
22,200
Expected for age
The average 2021 Aston Martin DBX had 16,258 miles on the clock at its 2024 MOT, which is below the expected 22,200 miles for a 3-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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About the 2021 Aston Martin DBX
The 2021 Aston Martin DBX is a luxury car. Our records list a 4000cc petrol engine, though engines vary between versions. 34 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 13% of all 2021 models for MOT pass rate.
With an average of 16,258 miles recorded at its 2024 MOT tests, Aston Martin DBX owners tend to use this car less than the typical driver.
2021 Aston Martin DBX Fuel Costs
The 4000cc 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 £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).
What does it cost to own a 2021 Aston Martin DBX?
Total estimated annual running cost is £2,413 (£201/month), broken down as £1,958 fuel, £200 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 Aston Martin DBX
At 5 years old, the Aston Martin DBX 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 34 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.
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 Aston Martin DBX stacks up against similar cars for estimated annual running costs, insurance group, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Est. Ins. Group | Total/yr |
|---|---|---|---|---|---|
| Aston Martin DBX(2021) | 97% | £1,958 | £200 | Grp 35-50 | £2,413 |
| Mercedes C(2019) | 91% | £1,958 | £200 | Grp 35-50 | £2,413same |
| Porsche Cayenne(2019) | 95% | £1,958 | £200 | Grp 35-50 | £2,413same |
| Porsche 911(2019) | 97% | £1,958 | £200 | Grp 35-50 | £2,413same |
| Audi A6(2020) | 94% | £1,958 | £200 | Grp 35-50 | £2,413same |
Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.
Questions about the 2021 Aston Martin DBX
Is the 2021 Aston Martin DBX reliable?
Excellent reliability. Very few MOT failures. 97% of MOT tests on 2021 Aston Martin DBXs ended in a pass, from 34 tests (DVSA MOT data for tests in 2024, retests included). That's 15 points above the average of 82% across all models in the same data.
How much does a 2021 Aston Martin DBX cost to run?
Our estimate is £2,413 a year (£201 a month): £1,958 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.
What is the MOT pass rate for a 2021 Aston Martin DBX?
97% of 34 MOT tests on the 2021 Aston Martin DBX ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 429th of 3,336 models first registered in 2021 (top 13%).
What is the average mileage for a 2021 Aston Martin DBX?
The average mileage recorded at MOT tests on the 2021 Aston Martin DBX is 16,258 miles, which is below the expected 22,200 miles for a 3-year-old car. This suggests lighter use than average, which generally means less wear on major components.
Related Aston Martin Models
Explore other Aston Martin cars or similar models in the same category.
Aston Martin Vantage
2019 · 3982cc Petrol
Aston Martin DB9
2005 · 5935cc Petrol
Aston Martin DB11
2017 · 3982cc Petrol
Mercedes C
2019 · 3982cc Petrol
Porsche Cayenne
2019 · 3996cc Petrol
Porsche 911
2019 · 3996cc Petrol
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