PEUGEOT 508 (2020)
Running costs, reliability data, and common problems from 2,662 real MOT tests.
Annual Cost
£1,505
£125/month
MOT Pass Rate
87%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 12-25
1500cc Diesel
Solid Option
87% pass rate, £1505/year to run. 5 points above average.
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Annual Running Costs
~55 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 PEUGEOT brand average of 83%.
At 6 years old, 87% of PEUGEOT 508s from 2020 passed their MOT first time in 2026. That's based on 2,662 tests across the UK. The average mileage at this age is 47,497 miles.
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How Does It Compare?
Mileage Analysis
47,497
Average miles
44,400
Expected for age
The average 2020 PEUGEOT 508 has 47,497 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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Best Year to Buy?
The most reliable year is the 2018 model with a 95% MOT pass rate, while the 2013 model has the lowest at 77%. The 2020 sits between the two at 87%.
PEUGEOT 508 by Year
Similar Cars to Consider
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About the 2020 PEUGEOT 508
The 2020 PEUGEOT 508 is a small family car with a 1500cc diesel engine. 2,662 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. It sits in the bottom 85% of 2020 cars for MOT pass rates.
With an average of 47,497 miles at 6 years old, PEUGEOT 508 owners drive about as much as the UK average.
2020 PEUGEOT 508 Fuel Costs
The 1500cc diesel engine offers a reasonable balance between performance and economy. Expect around 55 mpg in mixed driving, which works out to roughly £905 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 PEUGEOT 508?
Total estimated annual running cost is £1,505 (£125/month), broken down as £905 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 87% pass rate. Keeping on top of servicing will help avoid surprises.
PEUGEOT 508 Reliability Trend
Newer PEUGEOT 508s show better MOT pass rates than older ones, with an average improvement of 9 percentage points.
Buying a Used 2020 PEUGEOT 508
At 6 years old, the PEUGEOT 508 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 2018 model has the highest pass rate at 95%.
Common Issues to Watch For
Based on the 2020 PEUGEOT 508'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 PEUGEOT 508 stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| PEUGEOT 508(2020) | 87% | £905 | £195 | Grp 12-25 | £1505 |
| VOLKSWAGEN GOLF(2018) | 92% | £1037 | £190 | Grp 18-32 | £1482-£23 |
| FORD FOCUS(2019) | 89% | £905 | £190 | Grp 12-25 | £1500-£5 |
| MERCEDES A(2019) | 91% | £905 | £190 | Grp 12-25 | £1350-£155 |
| MERCEDES A-CLASS(2018) | 89% | £905 | £190 | Grp 12-25 | £1500-£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 Peugeot Models
Explore other Peugeot cars or similar models in the same category.
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PEUGEOT 207
2010 · 1360cc Petrol
PEUGEOT 3008
2018 · 1500cc Diesel
VOLKSWAGEN GOLF
2018 · 1968cc Diesel
FORD FOCUS
2019 · 1499cc Diesel
MERCEDES A
2019 · 1461cc Diesel
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