Mercedes B
Reliability, running costs, and MOT data across 5 years from 14,226 real MOT tests.
Avg Pass Rate
95%
Total Tests
14,226
Best Year
2022 (100%)
Years Covered
5
How reliable is the Mercedes B?
Mercedes B by Year
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About the Mercedes B
The Mercedes B has been tested 14,226 times in 2024 MOT data across 5 model years (2018 to 2022), with an average pass rate of 95%. That's comfortably above the national average of 82%, making it a reliable choice. Available as petrol and diesel.
Best and Worst Years
The 2022 model is the most reliable with a 100% pass rate from 34 tests. The 2018 model has the lowest at 91%. The 9 point spread between years means reliability varies somewhat, but no year is dramatically different.
Reliability Trend
The MERCEDES B has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.
Mileage Across Years
The oldest model in our data (2018) averages 36,999 miles, while the newest (2022) averages 23,239 miles.
Compared to the Mercedes brand average of 87%, the B performs 8 points better, making it one of the more reliable options in the Mercedes range.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.