Mercedes-Benz B-Class build years & generations
The Mercedes-Benz B-Class spans several build years and named generations (2005-present). Match a build year to its generation, then see how each group of build years does at its MOT.
Which year is which
Build years & generations, side by side
Find the build years you're looking at and see which generation they are. You'll also see which group of build years the MOT figures come from.
Built 2005-2008
- Generation
- W245
- Figures from
- cars built 2005-2008
Counted with this generation only.
Built 2009-2011
- Generation
- W245
- Figures from
- cars built 2009-2012
Counted together with W245 and W246 cars built in the same years.
Built 2012
- Generation
- W246
- Figures from
- cars built 2009-2012
Counted together with W245 and W246 cars built in the same years.
Built 2013-2014
- Generation
- W246
- Figures from
- cars built 2013-2016
Counted together with W246 and W246 facelift cars built in the same years.
Built 2015-2016
- Generation
- W246 facelift
- Figures from
- cars built 2013-2016
Counted together with W246 and W246 facelift cars built in the same years.
Built 2017-2018
- Generation
- W246 facelift
- Figures from
- cars built 2017-2020
Counted together with W246 facelift and W247 cars built in the same years.
Built 2019-2020
- Generation
- W247
- Figures from
- cars built 2017-2020
Counted together with W246 facelift and W247 cars built in the same years.
Built 2021+
- Generation
- W247
- Figures from
- cars built 2021 onwards
Counted with every car built from 2021.
“Figures from” is the group of build years behind each card's MOT figures. Years where one generation gave way to the next can sit in a wider group until there's enough history to split them.
By build-year group
How each group of build years performs
Each card shows MOT results for one group of Mercedes-Benz B-Class build years. “Age” means the car's age on the day of its MOT, not its build year. “25+” groups every test on cars aged 25 or older.
Built2021 onwards
W247 only
All W247 cars built from 2021. Newer cars join this group until there is enough MOT history to split it.
Fail rate at 4 years old (latest age)
5.8%
UK average for cars this age: about 1 in 8 (12.5%)
Ages with data
3 to 4 years old
MOT tests counted
1,526
Chart shows
Age at the MOT
Not the build year
2021 onwards
W247 only
All W247 cars built from 2021. Newer cars join this group until there is enough MOT history to split it.
Fail rate at 4 years old (latest age)
5.8%
UK average for cars this age: about 1 in 8 (12.5%)
Ages with data
3 to 4 years old
MOT tests counted
1,526
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 3 years old.
Built2017-2020
A mix of W246 facelift and W247
These build years include both W246 facelift and W247 cars, so the figures are less exact than for a single generation.
Fail rate at 7 years old
15.4%
UK average for cars this age: about 1 in 6 (17.1%)
Ages with data
4 to 8 years old
MOT tests counted
19,033
Chart shows
Age at the MOT
Not the build year
2017-2020
A mix of W246 facelift and W247
These build years include both W246 facelift and W247 cars, so the figures are less exact than for a single generation.
Fail rate at 7 years old
15.4%
UK average for cars this age: about 1 in 6 (17.1%)
Ages with data
4 to 8 years old
MOT tests counted
19,033
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 8 years old.
Built2013-2016
A mix of W246 and W246 facelift
These build years include both W246 and W246 facelift cars, so the figures are less exact than for a single generation.
Fail rate at 12 years old (latest age)
22.6%
UK average for cars this age: about 1 in 4 (25.9%)
Ages with data
8 to 12 years old
MOT tests counted
32,891
Chart shows
Age at the MOT
Not the build year
2013-2016
A mix of W246 and W246 facelift
These build years include both W246 and W246 facelift cars, so the figures are less exact than for a single generation.
Fail rate at 12 years old (latest age)
22.6%
UK average for cars this age: about 1 in 4 (25.9%)
Ages with data
8 to 12 years old
MOT tests counted
32,891
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 12 years old.
Built2009-2012
A mix of W245 and W246
These build years include both W245 and W246 cars, so the figures are less exact than for a single generation.
Fail rate at 16 years old (latest age)
29.8%
UK average for cars this age: about 3 in 10 (30%)
Ages with data
12 to 16 years old
MOT tests counted
23,762
Chart shows
Age at the MOT
Not the build year
2009-2012
A mix of W245 and W246
These build years include both W245 and W246 cars, so the figures are less exact than for a single generation.
Fail rate at 16 years old (latest age)
29.8%
UK average for cars this age: about 3 in 10 (30%)
Ages with data
12 to 16 years old
MOT tests counted
23,762
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 15 years old.
Built2005-2008
W245 only
These build years are all W245, so the figures are almost all from that generation.
Fail rate at 20 years old (latest age)
29.4%
UK average for cars this age: about 3 in 10 (30.3%)
Ages with data
16 to 20 years old
MOT tests counted
10,084
Chart shows
Age at the MOT
Not the build year
2005-2008
W245 only
These build years are all W245, so the figures are almost all from that generation.
Fail rate at 20 years old (latest age)
29.4%
UK average for cars this age: about 3 in 10 (30.3%)
Ages with data
16 to 20 years old
MOT tests counted
10,084
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 18 years old.