PEUGEOT 508 GT LINE ED SW S/S PHEV A (2021)
Running costs, reliability data, and common problems from 30 real MOT tests.
Annual Cost
£1,587
£132/month
MOT Pass Rate
90%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 12-25
1600cc Hybrid
Great Choice
90% pass rate, £1587/year to run. 8 points above average.
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Annual Running Costs
~42 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 8 points above the national average of 82%. It also outperforms the PEUGEOT brand average of 83%.
At 5 years old, 90% of PEUGEOT 508 GT LINE ED SW S/S PHEV As from 2021 passed their MOT first time in 2026. That's based on 30 tests across the UK. The average mileage at this age is 38,442 miles.
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How Does It Compare?
Mileage Analysis
38,442
Average miles
37,000
Expected for age
The average 2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A has 38,442 miles on the clock, which is in line with the expected 37,000 miles for a 5-year-old car, suggesting normal everyday use.
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About the 2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A
The 2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A is a small family car with a 1600cc hybrid engine. 30 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 79% of 2021 cars for MOT pass rates.
With an average of 38,442 miles at 5 years old, PEUGEOT 508 GT LINE ED SW S/S PHEV A owners drive about as much as the UK average.
2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A Fuel Costs
The 1600cc hybrid engine offers a reasonable balance between performance and economy. Expect around 42 mpg in mixed driving, which works out to roughly £1,137 per year at current hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A?
Total estimated annual running cost is £1,587 (£132/month), broken down as £1137 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 90% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A
At 5 years old, the PEUGEOT 508 GT LINE ED SW S/S PHEV A 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 30 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 PEUGEOT 508 GT LINE ED SW S/S PHEV A's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 5 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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 PEUGEOT 508 GT LINE ED SW S/S PHEV A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| PEUGEOT 508 GT LINE ED SW S/S PHEV A(2021) | 90% | £1137 | £195 | Grp 12-25 | £1587 |
| TOYOTA YARIS(2019) | 93% | £1137 | £190 | Grp 12-25 | £1582-£5 |
| MINI COOPER S(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£5 |
| LAND ROVER RANGE ROVER SPORT(2019) | 94% | £1327 | £190 | Grp 18-32 | £1772+£185 |
| TOYOTA C-HR(2019) | 92% | £1327 | £190 | Grp 18-32 | £1772+£185 |
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.
PEUGEOT 208
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PEUGEOT 207
2010 · 1360cc Petrol
PEUGEOT 3008
2018 · 1500cc Diesel
TOYOTA YARIS
2019 · 1497cc Hybrid
MINI COOPER S
2019 · 1499cc Hybrid
LAND ROVER RANGE ROVER SPORT
2019 · 1997cc Hybrid
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