ISUZU D-MAX (2020)
Running costs, reliability data, and common problems from 4,081 real MOT tests.
Annual Cost
£1,637
£136/month
MOT Pass Rate
86%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1898cc Diesel
Solid Option
86% pass rate, £1637/year to run. Close to the national average.
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Annual Running Costs
~48 mpg
Flat rate (post-2017)
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
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It also outperforms the ISUZU brand average of 78%.
At 6 years old, 86% of ISUZU D-MAXs from 2020 passed their MOT first time in 2026. That's based on 4,081 tests across the UK. The average mileage at this age is 50,699 miles.
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Mileage Analysis
50,699
Average miles
44,400
Expected for age
The average 2020 ISUZU D-MAX has 50,699 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
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ISUZU D-MAX by Year
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About the 2020 ISUZU D-MAX
The 2020 ISUZU D-MAX is a family car with a 1898cc diesel engine. 4,081 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. It sits in the bottom 88% of 2020 cars for MOT pass rates.
With an average of 50,699 miles at 6 years old, ISUZU D-MAX owners drive about as much as the UK average.
2020 ISUZU D-MAX Fuel Costs
The 1898cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,037 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 2020 ISUZU D-MAX?
Total estimated annual running cost is £1,637 (£136/month), broken down as £1037 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 86% pass rate. Keeping on top of servicing will help avoid surprises.
ISUZU D-MAX Reliability Trend
Newer ISUZU D-MAXs show better MOT pass rates than older ones, with an average improvement of 6 percentage points.
Buying a Used 2020 ISUZU D-MAX
At 6 years old, the ISUZU D-MAX 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 2020 ISUZU D-MAX's fuel type, age, and engine size, these are the most likely problem areas to check.
DPF (Diesel Particulate Filter)
Watch outShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Medium riskDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
AdBlue System
Medium riskPost-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.
EGR Valve
Watch outExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
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 2020 ISUZU D-MAX stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| ISUZU D-MAX(2020) | 86% | £1037 | £195 | Grp 18-32 | £1637 |
| VOLKSWAGEN GOLF(2018) | 92% | £1037 | £190 | Grp 18-32 | £1482-£155 |
| FORD FOCUS(2019) | 89% | £905 | £190 | Grp 12-25 | £1500-£137 |
| MERCEDES A(2019) | 91% | £905 | £190 | Grp 12-25 | £1350-£287 |
| MERCEDES A-CLASS(2018) | 89% | £905 | £190 | Grp 12-25 | £1500-£137 |
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 Isuzu Models
Explore other Isuzu cars or similar models in the same category.
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ISUZU TF
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ISUZU D-MAX V-CROSS AUTO
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VOLKSWAGEN GOLF
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FORD FOCUS
2019 · 1499cc Diesel
MERCEDES A
2019 · 1461cc Diesel
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