MERCEDES B (2020)
Running costs, common problems, and reliability data based on 4,933 real MOT tests in 2024.
MOT Pass Rate
94%
Total Tests (2024)
4,933
Avg Mileage
25,490 mi
Est. Annual Cost
£1,482
Is the 2020 MERCEDES B reliable?
Excellent reliability. Very few MOT failures. That's 12 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 4 years old, 94% of MERCEDES Bs from 2020 passed their MOT first time in 2024. That's based on 4,933 tests across the UK. The average mileage at this age is 25,490 miles.
How does the 2020 MERCEDES B compare?
Mileage Analysis
The average 2020 MERCEDES B has 25,490 miles on the clock, which is in line with the expected 29,600 miles for a 4-year-old car, suggesting normal everyday use.
Best year to buy a MERCEDES B?
The most reliable year is the 2021 model with a 95% MOT pass rate, while the 2018 model has the lowest at 91%. The 2020 sits between the two at 94%.
How much does a 2020 MERCEDES B cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES B by Year
Checking a specific MERCEDES B?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2020 MERCEDES B
The 2020 MERCEDES B is a family car with a 1950cc diesel engine. 4,933 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. It ranks in the top 25% of all 2020 cars for reliability.
With an average of 25,490 miles at 4 years old, MERCEDES B owners drive about as much as the UK average.
2020 MERCEDES B Fuel Costs
The 1950cc 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).
What does it cost to own a 2020 MERCEDES B?
Total estimated annual running cost is £1,482 (£124/month), broken down as £1037 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 94% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES B Reliability Trend
The MERCEDES B has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.
Buying a Used 2020 MERCEDES B
At 4 years old, the MERCEDES B 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 2021 model has the highest pass rate at 95%.
Alternatives to the 2020 MERCEDES B
The MERCEDES B is actually the most reliable option among similar diesel family cars from this era. Here are comparable diesel cars with similar engines:
- VOLKSWAGEN GOLF (2018) 92% pass rate (-2%) from 111,972 tests
- FORD FOCUS (2019) 89% pass rate (-5%) from 93,803 tests
- MERCEDES A (2019) 91% pass rate (-3%) from 89,588 tests
- MERCEDES A-CLASS (2018) 89% pass rate (-5%) from 81,134 tests