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Mercedes Benz B MOT Check

MOT pass rates, common failures, and reliability data for the Mercedes Benz B. Check any B by registration number below.

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93.9%

Avg Pass Rate

+3.7%

vs Mercedes Benz Avg

6

Year Ranges

Excellent

Reliability

Mercedes Benz B — MOT Reliability Overview

The Mercedes Benz B has an average MOT pass rate of 93.9%, which is 3.7 percentage points above the Mercedes Benz brand average of 90.2%. This is a strong result, indicating that the B is well-engineered and tends to age well mechanically. Owners can expect fewer surprises at MOT time.

The most common reasons a Mercedes Benz B fails its MOT are a tyre seriously damaged, wiper blade missing or obviously not clearing the windscreen, the aim of a headlamp is not within limits laid down in the requirements. If you are preparing your B for its MOT, checking these areas first could save you a retest fee. Our detailed fault analysis includes estimated repair costs for each failure type.

Before buying a used Mercedes Benz B, we recommend checking the full MOT history, write-off status, outstanding finance, and stolen vehicle status. These checks can be done for free using the registration number.

MOT Pass Rate by Year

How the Mercedes Benz B performs at MOT across different model years.

2022

Based on 34 vehicles

100.0%Excellent
Mercedes Benz average: 90.2%
Dangerous Defects

0.0%

Mileage at 3yr

39k mi

2021

Based on 2,456 vehicles

95.3%Excellent
Mercedes Benz average: 90.2%
Dangerous Defects

1.2%

Retest Rate

5.0%

Mileage at 3yr

34k mi

2020

Based on 7,473 vehicles

93.9%Excellent
Mercedes Benz average: 90.2%
Dangerous Defects

1.9%

Retest Rate

5.8%

Mileage at 3yr

30k mi

Mileage at 5yr

47k mi

2019

Based on 9,752 vehicles

92.7%Excellent
Mercedes Benz average: 90.2%
Dangerous Defects

1.9%

Retest Rate

7.6%

Mileage at 3yr

32k mi

Mileage at 5yr

48k mi

2018

Based on 173 vehicles

90.8%Excellent
Mercedes Benz average: 90.2%
Dangerous Defects

4.7%

Retest Rate

6.5%

Mileage at 5yr

52k mi

2013

Based on 33 vehicles

90.9%Excellent
Mercedes Benz average: 90.2%
Dangerous Defects

0.0%

Mileage at 10yr

92k mi

Top MOT Failures — Mercedes Benz B

The most common reasons a Mercedes Benz B fails its MOT, aggregated across all year ranges.

1

A tyre seriously damaged

1.5%
2

Wiper blade missing or obviously not clearing the windscreen

1.0%
3

The aim of a headlamp is not within limits laid down in the requirements

0.8%
4

Tyre tread depth not in accordance with the requirements

0.6%
5

A tyre cords visible or damaged

0.5%
Mercedes Benz B Common Faults & Repair Costs

Other Mercedes Benz Models

Compare MOT reliability across Mercedes Benz models.

Mercedes Benz E 300

94.2% pass rate

Mercedes Benz E

83.5% pass rate

Mercedes Benz Amg Gla 45 S 4matic+ Auto

92.7% pass rate

Mercedes Benz V

85.8% pass rate

Mercedes Benz Vito 112

87.8% pass rate

Mercedes Benz Sl 500

100.0% pass rate

Useful MOT Guides

Common MOT Failures

The most common reasons UK vehicles fail their MOT — and how to prepare.

MOT Checklist

Pre-MOT checklist to improve your chances of passing first time.

Advisory vs Failure

Understanding the difference between MOT advisories and failures.

See detailed fault analysis for Mercedes Benz B

Mercedes Benz B — Frequently Asked Questions

Common questions about the Mercedes Benz B MOT and reliability.

What is the MOT pass rate for the Mercedes Benz B?
The average MOT pass rate for the Mercedes Benz B is 93.9% compared to the Mercedes Benz average of 90.2%. Pass rates vary by year — check the year-by-year breakdown on this page for details.
What are the most common MOT failures on a Mercedes Benz B?
The most common MOT failures on the Mercedes Benz B are: A tyre seriously damaged (1.5%), Wiper blade missing or obviously not clearing the windscreen (1.0%), The aim of a headlamp is not within limits laid down in the requirements (0.8%). These are the components most likely to cause an MOT failure.
Is the Mercedes Benz B reliable?
With an average MOT pass rate of 93.9%, the Mercedes Benz B is rated as "Excellent" for reliability. This is a strong result suggesting good build quality and fewer common defects.
How do I check the MOT history of a Mercedes Benz B?
Enter the vehicle's registration number in the search box at the top of this page. You will instantly see the complete MOT history including every test result, mileage readings, advisories, and dangerous defects — completely free.
What mileage should I expect on a Mercedes Benz B?
Typical mileage for the Mercedes Benz B: 38,537 miles at 3 years. Use these benchmarks when evaluating a used B to spot vehicles with unusually high or low mileage.

Check Your Mercedes Benz B's MOT History

Enter the registration number for the full MOT history — free and instant.

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