Should I check the MOT history before buying a 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto?

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 Amg Cla 45 S 4matic+ Plus Auto?

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 Amg Cla 45 S 4matic+ Plus Auto?

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 Amg Cla 45 S 4matic+ Plus Auto?

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 Amg Cla 45 S 4matic+ Plus Auto (2021)

Q: Is the 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto reliable?

Based on MOT data from 216 vehicles, the 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto has a first-time MOT pass rate of 90.1%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

216 real MOT outcomes analysed • 90.1% first-time pass rate

2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto

CarHunch analysed 216 real MOT records for the 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto. 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 AMG CLA 45 S posts a 75.1% first-time pass rate, sitting 4.9 points below the UK average—a meaningful gap that suggests these high-performance Mercedes demand more attention than most cars. The 13.4% dangerous defect rate is reassuring and well below the concern threshold, so safety isn't a primary worry here.

At 26,113 miles median for a 2021 model, these cars are running slightly low, which is the one bright spot in an otherwise demanding MOT picture. The average 0.26 failures and 0.9 advisories per vehicle tell the real story: owners face regular small repairs, typical of turbocharged four-cylinder engines and complex electronics in this class. Budget for annual servicing by a Mercedes specialist and have any pre-purchase example inspected by someone who knows the platform well.

We have limited data for the 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto — treat the figures below as indicative rather than definitive.

⚠️ 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

90.1%

UK average ~80%

Better than average

Dangerous (ever)

13.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.26

Over 2.1 tests on record

Low

Typical mileage

26k

Middle half: 19k–34k

For context

These stats describe 216 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 216 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto cars.

Before you buy a 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto

Based on MOT data from 216 vehicles — here's what to check.

📋 Check the full MOT history. 13.4% 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
Petrol (99%)	214	90%	0.27

Colour Breakdown

Based on 1,290 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto vehicles registered in the UK — across all years. From DVLA registration records.

Grey 36.4%

469

Black 32.5%

419

White 17.4%

224

Blue 5.8%

Red 3.8%

Yellow 2.6%

Silver 1.6%

Mileage Distribution

Most 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto 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.

26,113

typical

18,923

low mileage

34,046

high mileage

Half of all 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto vehicles fall between 18,923 and 34,046 miles.

Is the mileage you're seeing normal?

✓ Under 18,923 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.

✓ 18,923–34,046 miles — normal for age. This is where most 2021 Mercedes Benz Amg Cla 45 S 4matic+ Plus Autos sit.

⚠ Over 45,962 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

0.26

Avg failures per vehicle

0.9

Avg advisories per vehicle

Other model years — Mercedes Benz Amg Cla 45 S 4matic+ Plus Auto: All Amg Cla 45 S 4matic+ Plus Auto years → Which year to buy? →

2020 2022 2023 2024 2025

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