Should I check the MOT history before buying a 2021 Mercedes Benz C?

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 2021 Mercedes Benz C?

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 2021 Mercedes Benz C?

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.

Is the 2021 Mercedes Benz C reliable?

Based on MOT data from 1,666 vehicles, the 2021 Mercedes Benz C has a first-time MOT pass rate of 91.7%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2021 Mercedes Benz C?

The most frequently recorded MOT issues on the 2021 Mercedes Benz C are: Offside Rear Tyre worn close to legal limit/worn on edge (28.3% of vehicles), Nearside Rear Tyre worn close to legal limit/worn on edge (27.8% of vehicles), Nearside Front Tyre worn close to legal limit/worn on edge (20% 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 2021 Mercedes Benz C?

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.

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Mercedes Benz C (2021)

1,666 real MOT outcomes analysed • 91.7% first-time pass rate

2021 Mercedes Benz C

CarHunch analysed 1,666 real MOT records for the 2021 Mercedes Benz C. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

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

The 2021 Mercedes-Benz C is a notably reliable proposition, with a first-time pass rate of 91.7% — well ahead of the UK average of 80%. Dangerous defects have appeared in 14.6% of vehicles tested, which is a moderate concern but not exceptional, and the hybrid, diesel, and petrol variants all perform similarly around 91–92% pass rates.

At a median mileage of 26,000 miles for a three-year-old car, these examples have been driven sensibly, and the low failure rate of 0.28 per vehicle reflects careful ownership or robust build quality. The 1.7 advisories per car suggest minor wear items rather than structural problems—typical for a premium German saloon. When shopping for one, prioritise a full service history and get a pre-purchase inspection to confirm suspension and brake components haven't been neglected.

The 2021 Mercedes Benz C passes its MOT first time more often than most UK vehicles (91.7% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ Around 1 in 8 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

91.7%

UK average ~80%

Better than average

Dangerous (ever)

14.7%

At least once in MOT history

Check this vehicle

Avg failures / car

0.28

Over 2.5 tests on record

Low

Typical mileage

26k

Middle half: 19k–36k

For context

✅ Good baseline reliability. A 91.7% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔧 Expect consumable spend. An average of 1.7 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 1,666 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.

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What tends to go wrong

Across 1,666 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 28.3%

Offside Rear Tyre worn close to legal limit/worn on edge · Nearside Rear Tyre worn close to legal limit/worn on edge · Nearside Front Tyre worn close to legal limit/worn on edge · …

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

Brake wear 17.9%

Rear Brake pad(s) wearing thin · Front Brake pad(s) wearing thin · Offside Rear Brake pad(s) wearing thin

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

Other issues 5.1%

Windscreen damaged but not adversely affecting driver's view · Nearside Rear Child Seat fitted not allowing full inspection of adult belt

Lighting 4%

Rear Prop shaft flexible coupling slightly deteriorated

Usually cheap to fix. Worth confirming all lights work before collecting.

Data covers a 3-year window centred on 2021.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 1,666 Mercedes Benz C cars.

Before you buy a 2021 Mercedes Benz C

Based on MOT data from 1,666 vehicles — here's what to check.

📋 Check the full MOT history. 14.7% 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
Hybrid Electric (Clean) (45%)	754	91.9%	0.26
Diesel (42%)	707	91.4%	0.3
Petrol (12%)	205	91.8%	0.27

Colour Breakdown

Based on 667,977 Mercedes Benz C vehicles registered in the UK — across all years. From DVLA registration records.

Silver 34.7%

231,844

Black 24.7%

164,730

Blue 14.6%

97,214

White 9.6%

64,104

Grey 9.1%

60,907

Red 4.2%

28,290

Green 1.9%

12,661

Beige 0.4%

2,836

Purple 0.3%

1,844

Gold 0.2%

1,650

Brown 0.1%

994

Orange 0.1%

903

Mileage Distribution

Most 2021 Mercedes Benz C 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.

25,969

typical

18,589

low mileage

35,862

high mileage

Half of all 2021 Mercedes Benz C vehicles fall between 18,589 and 35,862 miles.

Is the mileage you're seeing normal?

✓ Under 18,589 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.

✓ 18,589–35,862 miles — normal for age. This is where most 2021 Mercedes Benz Cs sit.

⚠ Over 48,413 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2021 Mercedes Benz C — Still on the Road

Almost all 2021 Mercedes Benz Cs are still on the road.

Strong survival — 1,595 vehicles still getting MOTs in 2025, 98% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.

MOT History Averages

2.5

Avg MOT tests per vehicle

0.28

Avg failures per vehicle

1.7

Avg advisories per vehicle

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

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Compare with another model

See how the 2021 Mercedes Benz C stacks up against a rival.

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