Should I check the MOT history before buying a 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma?

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 Cls400 Amg Ln Nt Ed Prm+ D 4ma?

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 Cls400 Amg Ln Nt Ed Prm+ D 4ma?

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 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma vehicles have had dangerous defects recorded?

29% 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.

Do I need an HPI check when buying a 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma?

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 Cls400 Amg Ln Nt Ed Prm+ D 4ma (2021)

Q: Is the 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma reliable?

Based on MOT data from 177 vehicles, the 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma has a first-time MOT pass rate of 87.6%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

177 real MOT outcomes analysed • 87.6% first-time pass rate

2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma

CarHunch analysed 177 real MOT records for the 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma. 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 Mileage Distribution MOT Averages Compare Models

This Mercedes-Benz CLS400 diesel passes its MOT first time in 85.6% of cases, which is a solid 5.6 percentage points above the UK average—but the dangerous defect rate of 28.8% is a genuine red flag, suggesting buyers should budget for potentially serious repairs, especially around brake and suspension components typical of this class. Petrol and diesel breakdowns aren't available for this cohort, so the diesel variant's track record here speaks for itself.

At just under 28,000 miles median for a 2021 model, these cars are relatively lightly used, yet they're averaging 1.2 advisories per test, indicating that even low-mileage examples are picking up minor wear items—likely cabin electronics, trim, or minor fluid leaks rather than structural faults. Before committing to one, have an independent pre-purchase inspection focus on the suspension, braking system, and any fluid seepage, as the dangerous defect prevalence suggests these areas need close attention in this generation.

We have limited data for the 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma — treat the figures below as indicative rather than definitive.

⚠️ 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

87.6%

UK average ~80%

Around average

Dangerous (ever)

28.8%

At least once in MOT history

Check this vehicle

Avg failures / car

0.41

Over 2.4 tests on record

Low

Typical mileage

28k

Middle half: 20k–39k

For context

These stats describe 177 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

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 177 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma cars.

Before you buy a 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma

Based on MOT data from 177 vehicles — here's what to check.

📋 Check the full MOT history. 28.8% 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

Mileage Distribution

Most 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma 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.

27,537

typical

20,375

low mileage

39,147

high mileage

Half of all 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma vehicles fall between 20,375 and 39,147 miles.

Is the mileage you're seeing normal?

✓ Under 20,375 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.

✓ 20,375–39,147 miles — normal for age. This is where most 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4mas sit.

⚠ Over 52,848 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

2.4

Avg MOT tests per vehicle

0.41

Avg failures per vehicle

1.2

Avg advisories per vehicle

Compare with another model

See how the 2021 Mercedes Benz Cls400 Amg Ln Nt Ed Prm+ D 4ma stacks up against a rival.

Watch for defects — worth knowing