Mercedes B CLASS

69,021 on UK roads in 2025-2,444 vs 2024

On the road

69,021

69,021 licensed

Change vs 2024

-3.4%

-2,444 cars

New in 2025

340

first-time registrations

Electrified

2.8%

hybrid, plug-in & battery

The Mercedes B CLASS is a common sight on UK roads, with 69,021 licensed in 2025 - down 3.4% on 2024. 340 were registered new in 2025. The fleet is overwhelmingly diesel (63%), with most in the 1.0-1.6L class. Most date from the 2010-2014 era.

How many are left?

Licensed Mercedes B CLASS cars on the road over time

New registrations

First-time registrations per year

What the typical Mercedes B CLASS looks like

Fuel, engine size and age across every Mercedes B CLASS on the road today.

Fuel mix

Current split

69,021total

Petrol34.0%
Diesel63.1%
Hybrid1.6%
Plug-in Hybrid0.7%
Battery Electric0.5%
Other0.0%

Engine size

Cars on the road by engine capacity

Electric371
1.0-1.6L27,433
1.6-2.0L21,733
2.0-3.0L19,484

How old are they?

Share of cars by the year they were first registered

2005-200914%
2010-201440%
2015-201935%
2020-202511%

MOT & reliability

2025 MOT data

How a Mercedes B Class holds up at its MOT and how it's driven - from 74,788 tests, tracked across 2022-2025.

First-time pass rate

Average for its class

74.9%

74,788 MOT tests in 2025 · 60,702 first-time

Pass rate over time

2022

78.4%

2023

76.5%

2024

75.2%

2025

74.9%

▼ 3.5 pts since 2022

Pass rate by age

First-time pass rate by the car's age (tested in 2025)

How a Mercedes B Class is driven

tracked across 2022-25

How much it's driven

miles a year, from 65,391 cars tracked across years

6,319miles a year · average use

44.5%

low · <5k

51.6%

avg · 5-15k

3.9%

high · 15k+

Most cover 3,366-8,202 miles a year (median 5,477).

Miles driven by age

Yearly mileage as the car ages

Driven most when newer, easing as it gets older.

Mileage & condition

Typical mileage at test

Odometer when tested (2025)

77,872

35,208middle 50%: 51,858-99,690124,109

Typical odometer rising: 65,253 → 69,778 → 74,030 → 77,872

Holds up by mileage

Pass rate as the odometer climbs

Under 40k

88.7%

40-80k

78.3%

80-120k

68.6%

120k+

64.5%

Petrol vs diesel

First-time pass rate by fuel

Diesel

41,238 tests

74.7%

Petrol

19,072 tests

75.3%

A 2025 Mercedes B Class passes first time 74.9% of the time - below the 77.6% UK average, and easing slightly year on year. The typical one is driven about 6,319 miles a year, and reliability is mostly about miles: 88.7% of low-mileage cars pass versus 64.5% past 120k.

Why a B CLASS fails its MOT

2025 MOT data

Of 15,236 first-time fails, here's what gets flagged most. Most cars fail on more than one item, so shares add up past 100%.

Where a B CLASS fails

Share of failed tests, by area

Suspension43%

Lamps & electrical31.3%

Tyres27%

Brakes24.9%

Visibility13%

Body & structure12.9%

Exhaust & emissions11.9%

Seat belts5.2%

Top specific defects

Exact items most often recorded as the reason a car failed

A spring or spring component fractured or seriously weakened2,572

A suspension joint dust cover missing or no longer prevents the ingress of dirt etc2,469

A tyre seriously damaged2,014

A suspension pin, bush or joint excessively worn1,649

A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc1,430

Engine MIL illuminated indicating a malfunction1,339

Windscreen washers not working or not providing sufficient fluid to clear the windscreen1,222

A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps1,212

A brake lining or pad worn below 1.5mm1,042

A tyre cords visible or damaged1,036

30.2% flagged dangerous·2.4 defects per fail·15,236 fails analysed

Mercedes B CLASS - frequently asked

How many Mercedes B CLASS are left in the UK?

There are 69,021 Mercedes B CLASS cars still licensed on UK roads in 2025, down 3.4% on 2024.

How many new Mercedes B CLASS were registered in 2025?

340 brand-new Mercedes B CLASS cars were first registered in 2025.

What fuel does the typical Mercedes B CLASS use?

Most are diesel - about 63% of all Mercedes B CLASS on the road, with the majority in the 1.0-1.6L engine class. In total, 2.8% are electrified (hybrid, plug-in or battery).

How old is the typical Mercedes B CLASS?

Most Mercedes B CLASS cars on the road today date from the 2010-2014 era.

How reliable is the Mercedes B CLASS?

74.9% of Mercedes B CLASS cars pass their MOT first time, compared with a UK average of 77.6% across all cars. The typical tested Mercedes B CLASS has around 74,676 miles on the clock.

Buying a Mercedes B CLASS?

Before you buy a specific Mercedes B CLASS, run its registration through AnalyzeMyCar for MOT history, mileage checks, service history and valuation.

Check a car

What the typical Mercedes B CLASS looks like

Fuel, engine size and age across every Mercedes B CLASS on the road today.

Fuel mix

Current split

69,021total

Petrol34.0%
Diesel63.1%
Hybrid1.6%
Plug-in Hybrid0.7%
Battery Electric0.5%
Other0.0%

Engine size

Cars on the road by engine capacity

Electric371
1.0-1.6L27,433
1.6-2.0L21,733
2.0-3.0L19,484

How old are they?

Share of cars by the year they were first registered

2005-200914%
2010-201440%
2015-201935%
2020-202511%

MOT & reliability

2025 MOT data

How a Mercedes B Class holds up at its MOT and how it's driven - from 74,788 tests, tracked across 2022-2025.

First-time pass rate

Average for its class

74.9%

74,788 MOT tests in 2025 · 60,702 first-time

Pass rate over time

2022

78.4%

2023

76.5%

2024

75.2%

2025

74.9%

▼ 3.5 pts since 2022

Pass rate by age

First-time pass rate by the car's age (tested in 2025)

How a Mercedes B Class is driven

tracked across 2022-25

How much it's driven

miles a year, from 65,391 cars tracked across years

6,319miles a year · average use

44.5%

low · <5k

51.6%

avg · 5-15k

3.9%

high · 15k+

Most cover 3,366-8,202 miles a year (median 5,477).

Miles driven by age

Yearly mileage as the car ages

Driven most when newer, easing as it gets older.

Mileage & condition

Typical mileage at test

Odometer when tested (2025)

77,872

35,208middle 50%: 51,858-99,690124,109

Typical odometer rising: 65,253 → 69,778 → 74,030 → 77,872

Holds up by mileage

Pass rate as the odometer climbs

Under 40k

88.7%

40-80k

78.3%

80-120k

68.6%

120k+

64.5%

Petrol vs diesel

First-time pass rate by fuel

Diesel

41,238 tests

74.7%

Petrol

19,072 tests

75.3%

Why a B CLASS fails its MOT

2025 MOT data

Of 15,236 first-time fails, here's what gets flagged most. Most cars fail on more than one item, so shares add up past 100%.

Where a B CLASS fails

Share of failed tests, by area

Suspension43%

Lamps & electrical31.3%

Tyres27%

Brakes24.9%

Visibility13%

Body & structure12.9%

Exhaust & emissions11.9%

Seat belts5.2%

Top specific defects

Exact items most often recorded as the reason a car failed

A spring or spring component fractured or seriously weakened2,572

A suspension joint dust cover missing or no longer prevents the ingress of dirt etc2,469

A tyre seriously damaged2,014

A suspension pin, bush or joint excessively worn1,649

A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc1,430

Engine MIL illuminated indicating a malfunction1,339

Windscreen washers not working or not providing sufficient fluid to clear the windscreen1,222

A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps1,212

A brake lining or pad worn below 1.5mm1,042

A tyre cords visible or damaged1,036

30.2% flagged dangerous·2.4 defects per fail·15,236 fails analysed

Mercedes B CLASS - frequently asked

How many Mercedes B CLASS are left in the UK?

There are 69,021 Mercedes B CLASS cars still licensed on UK roads in 2025, down 3.4% on 2024.

How many new Mercedes B CLASS were registered in 2025?

340 brand-new Mercedes B CLASS cars were first registered in 2025.

What fuel does the typical Mercedes B CLASS use?

Most are diesel - about 63% of all Mercedes B CLASS on the road, with the majority in the 1.0-1.6L engine class. In total, 2.8% are electrified (hybrid, plug-in or battery).

How old is the typical Mercedes B CLASS?

Most Mercedes B CLASS cars on the road today date from the 2010-2014 era.

How reliable is the Mercedes B CLASS?

74.9% of Mercedes B CLASS cars pass their MOT first time, compared with a UK average of 77.6% across all cars. The typical tested Mercedes B CLASS has around 74,676 miles on the clock.

Buying a Mercedes B CLASS?

Before you buy a specific Mercedes B CLASS, run its registration through AnalyzeMyCar for MOT history, mileage checks, service history and valuation.

Check a car