Should I check the MOT history before buying a 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A?

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 Glc 300 Amg Line Prem De 4m A?

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 Glc 300 Amg Line Prem De 4m A?

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.

Do I need an HPI check when buying a 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A?

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 Glc 300 Amg Line Prem De 4m A (2021)

Q: Is the 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A reliable?

Based on MOT data from 700 vehicles, the 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A has a first-time MOT pass rate of 94.3%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

700 real MOT outcomes analysed • 94.3% first-time pass rate

2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A

CarHunch analysed 700 real MOT records for the 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution MOT Averages Colour Breakdown Compare Models

This 2021 GLC 300 AMG is proving more reliable than the UK average, with an 86.7% first-time pass rate versus the national 80%, and only 7.4% of vehicles have ever recorded a dangerous defect—well below the concern threshold. The electric diesel variant passes at 86.6%, indicating consistent performance across the fuel type.

At a median mileage of 33,235 miles for a three-year-old car, these vehicles are running within expected usage patterns, and the low failure rate of 0.16 per vehicle suggests mechanically sound engineering. The 1.3 advisories per test indicate minor wear items rather than systemic problems, so when you're evaluating one, get a pre-purchase inspection focused on the air suspension and brake components—the typical culprits on this platform—rather than expecting widespread failures.

The 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A passes its MOT first time more often than most UK vehicles (94.3% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ Around 1 in 20 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

94.3%

UK average ~80%

Better than average

Dangerous (ever)

7.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.16

Over 2.1 tests on record

Low

Typical mileage

33k

Middle half: 25k–47k

For context

✅ Good baseline reliability. A 94.3% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔍 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 700 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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See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 700 Mercedes Benz Glc 300 Amg Line Prem De 4m A cars.

Before you buy a 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A

Based on MOT data from 700 vehicles — here's what to check.

📋 Check the full MOT history. 7.4% 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
Electric Diesel (99%)	696	94.3%	0.17

Colour Breakdown

Based on 1,301 Mercedes Benz Glc 300 Amg Line Prem De 4m A vehicles registered in the UK — across all years. From DVLA registration records.

Black 36.6%

476

Grey 28.6%

372

Silver 13.8%

179

Blue 11.3%

147

White 6%

Red 3.8%

Mileage Distribution

Most 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A 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.

33,235

typical

25,031

low mileage

47,415

high mileage

Half of all 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A vehicles fall between 25,031 and 47,415 miles.

Is the mileage you're seeing normal?

✓ Under 25,031 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.

✓ 25,031–47,415 miles — normal for age. This is where most 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m As sit.

⚠ Over 64,010 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

MOT History Averages

2.1

Avg MOT tests per vehicle

0.16

Avg failures per vehicle

1.3

Avg advisories per vehicle

Other model years — Mercedes Benz Glc 300 Amg Line Prem De 4m A: All Glc 300 Amg Line Prem De 4m A years → Which year to buy? →

2020 2022

Or browse all models: Mercedes Benz →

Compare with another model

See how the 2021 Mercedes Benz Glc 300 Amg Line Prem De 4m A stacks up against a rival.

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