Should I check the MOT history before buying a 2012 Mercedes Benz B Class?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2012 Mercedes Benz B Class?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2012 Mercedes Benz B Class?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

How many 2012 Mercedes Benz B Class vehicles have had dangerous defects recorded?

43% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2012 Mercedes Benz B Class reliable?

Based on MOT data from 6,414 vehicles, the 2012 Mercedes Benz B Class has a first-time MOT pass rate of 83%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2012 Mercedes Benz B Class?

The most frequently recorded MOT issues on the 2012 Mercedes Benz B Class are: Nearside Front Tyre worn close to legal limit/worn on edge (44.6% of vehicles), Offside Front Tyre worn close to legal limit/worn on edge (43.6% of vehicles), Nearside Rear Brake pipe corroded, covered in grease or other material (36.6% of vehicles). These figures are based on actual MOT test records — search a specific registration on CarHunch to see its individual history.

Do I need an HPI check when buying a 2012 Mercedes Benz B Class?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

CarHunch

Get Started

Mercedes Benz B Class (2012)

6,414 real MOT outcomes analysed • 83% first-time pass rate

2012 Mercedes Benz B Class

CarHunch analysed 6,414 real MOT records for the 2012 Mercedes Benz B Class. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

On this page

AI Analysis Reliability Overview Common Issues Check a Specific Reg Petrol vs Diesel Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2012 Mercedes-Benz B-Class passes its MOT slightly above the UK average at 83%, but the real concern is that 43.2% of these vehicles have recorded at least one dangerous defect during their MOT history—nearly double the typical rate. Petrol variants perform noticeably better than diesel, with an 85.4% pass rate versus 82.0%, so if you're choosing between the two, petrol is the safer bet.

At around 63,000 miles median, these cars are showing their age with an average of 2.31 failures and 12.4 advisories per test, suggesting ongoing wear and potential electrical or suspension issues. Before purchasing, insist on a full service history and get a pre-purchase inspection focused on recent MOT advisories—the high dangerous-defect rate means you need to understand exactly what faults you're inheriting.

The 2012 Mercedes Benz B Class has a decent first-time pass rate (83%), but a higher-than-average share of vehicles have had serious defects recorded — the individual vehicle's history matters a lot here.

⚠️ Over 1 in 5 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

83%

UK average ~80%

Around average

Dangerous (ever)

43.3%

At least once in MOT history

Check this vehicle

Avg failures / car

2.31

Over 12.5 tests on record

High

Typical mileage

63k

Middle half: 47k–78k

For context

🔧 Average reliability. Passes at roughly the UK rate — not a standout, not a problem vehicle. Individual history makes all the difference.

🔧 Expect consumable spend. An average of 12.4 advisories per vehicle tells you wear items (tyres, brakes) get flagged regularly. Budget for them — they're not surprises.

🔍 The dangerous defect figure is real. Most are one-off tyre failures or brake issues — not structural problems. But it's exactly why checking the individual vehicle's history is essential, not optional.

These stats describe 6,414 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Watch for defects — worth knowing

What tends to go wrong

Across 6,414 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 44.6%

Nearside Front Tyre worn close to legal limit/worn on edge · Offside Front Tyre worn close to legal limit/worn on edge · Nearside Rear Tyre slightly damaged/cracking or perishing · …

Budget for a full set — on a vehicle this age, tyres are expected consumables. An inspection will confirm how much is left.

Brake wear 36.6%

Nearside Rear Brake pipe corroded, covered in grease or other material · Offside Rear Brake pipe corroded, covered in grease or other material · Front Brake disc worn, pitted or scored, but not seriously weakened · …

Ask the seller when brakes were last serviced. If they don't know, factor in the cost.

Other issues 27.4%

Under-trays fitted obscuring some underside components · Nearside Rear Child Seat fitted not allowing full inspection of adult belt

Data covers a 3-year window centred on 2012.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 6,414 Mercedes Benz B Class cars.

Petrol vs Diesel

Pass rate difference of 3.4 percentage points — worth knowing if you're choosing between the two.

85.4%

Petrol

1,851 vehicles

82%

Diesel

4,563 vehicles

Before you buy a 2012 Mercedes Benz B Class

Based on MOT data from 6,414 vehicles — here's what to check.

📋 Check the full MOT history. 43.3% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Diesel (71%)	4,563	82%	2.46
Petrol (29%)	1,851	85.4%	1.93

Colour Breakdown

Based on 77,010 Mercedes Benz B Class vehicles registered in the UK — across all years. From DVLA registration records.

Black 24.5%

18,872

Silver 22.4%

17,281

Grey 19.2%

14,820

Blue 17%

13,065

White 9.9%

7,612

Red 4.9%

3,768

Gold 0.6%

441

Purple 0.5%

393

Brown 0.4%

285

Bronze 0.2%

182

Green 0.2%

149

Beige 0.2%

142

Mileage Distribution

Most 2012 Mercedes Benz B Class vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

62,872

typical

47,314

low mileage

78,234

high mileage

Half of all 2012 Mercedes Benz B Class vehicles fall between 47,314 and 78,234 miles.

Is the mileage you're seeing normal?

✓ Under 47,314 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 47,314–78,234 miles — normal for age. This is where most 2012 Mercedes Benz B Classs sit.

⚠ Over 105,615 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2012 Mercedes Benz B Class — Still on the Road

Almost all 2012 Mercedes Benz B Classs are still on the road.

Strong survival — 5,464 vehicles still getting MOTs in 2025, 93% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2015–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

12.5

Avg MOT tests per vehicle

2.31

Avg failures per vehicle

12.4

Avg advisories per vehicle

Other model years — Mercedes Benz B Class: All B Class years → Which year to buy? →

2005 2006 2007 2008 2009 2010 2011 2013 2014 2015 2016 2017 2018 2019

Or browse all models: Mercedes Benz →

Compare with another model

See how the 2012 Mercedes Benz B Class stacks up against a rival.

Watch for defects — worth knowing