Should I check the MOT history before buying a 2018 Mercedes Benz Cla?

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 2018 Mercedes Benz Cla?

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 2018 Mercedes Benz Cla?

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 2018 Mercedes Benz Cla vehicles have had dangerous defects recorded?

33% 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 2018 Mercedes Benz Cla reliable?

Based on MOT data from 8,494 vehicles, the 2018 Mercedes Benz Cla has a first-time MOT pass rate of 87.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2018 Mercedes Benz Cla?

The most frequently recorded MOT issues on the 2018 Mercedes Benz Cla are: Offside Front Tyre worn close to legal limit/worn on edge (42.6% of vehicles), Nearside Front Tyre worn close to legal limit/worn on edge (41.9% of vehicles), Front Brake pad(s) wearing thin (23.1% 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 2018 Mercedes Benz Cla?

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 Cla (2018)

8,494 real MOT outcomes analysed • 87.2% first-time pass rate

2018 Mercedes Benz Cla

CarHunch analysed 8,494 real MOT records for the 2018 Mercedes Benz Cla. 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 Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2018 Mercedes-Benz CLA passes its MOT at 87.2%, which is well above the UK average of 80%, but a significant concern emerges in the dangerous defects column: one in three of these cars (33.3%) has recorded a dangerous fault at some point, well above what you'd want to see. Petrol and diesel variants perform almost identically, both around 87%, so fuel choice won't materially affect reliability expectations.

At a median mileage of 37,311 miles for a six-year-old car, these CLAs are running lighter than average, which partly explains the strong pass rate. When failures do occur, they average 0.86 per vehicle with 5.3 advisories, suggesting minor wear issues crop up regularly but major breakdowns remain uncommon—however, before buying one, get a pre-purchase inspection that specifically checks the suspension, braking system, and electrical components, as these are where the dangerous defects are concentrated in this generation.

The 2018 Mercedes Benz Cla has a decent first-time pass rate (87.2%), 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

87.2%

UK average ~80%

Around average

Dangerous (ever)

33.3%

At least once in MOT history

Check this vehicle

Avg failures / car

0.86

Over 5.9 tests on record

Moderate

Typical mileage

37k

Middle half: 29k–48k

For context

✅ Good baseline reliability. A 87.2% 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 5.3 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 8,494 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 8,494 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 42.6%

Offside Front Tyre worn close to legal limit/worn on edge · Nearside Front Tyre worn close to legal limit/worn on edge · Offside 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 23.1%

Front Brake pad(s) wearing thin · Rear Brake pad(s) wearing thin · 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 12.2%

Nearside Rear Child Seat fitted not allowing full inspection of adult belt · COVID-19 6 MONTH EXTENSION · Windscreen damaged but not adversely affecting driver's view

Data covers a 3-year window centred on 2018.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 8,494 Mercedes Benz Cla cars.

Before you buy a 2018 Mercedes Benz Cla

Based on MOT data from 8,494 vehicles — here's what to check.

📋 Check the full MOT history. 33.3% 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
Petrol (57%)	4,848	87.6%	0.84
Diesel (43%)	3,646	86.8%	0.89

Colour Breakdown

Based on 64,873 Mercedes Benz Cla vehicles registered in the UK — across all years. From DVLA registration records.

Black 29.6%

19,209

White 27.6%

17,907

Grey 22.2%

14,431

Silver 8%

5,174

Red 6.9%

4,447

Blue 4.5%

2,923

Purple 1.1%

692

Bronze 0.1%

Green 0%

Gold 0%

Brown 0%

Mileage Distribution

Most 2018 Mercedes Benz Cla 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.

37,311

typical

28,569

low mileage

47,698

high mileage

Half of all 2018 Mercedes Benz Cla vehicles fall between 28,569 and 47,698 miles.

Is the mileage you're seeing normal?

✓ Under 28,569 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.

✓ 28,569–47,698 miles — normal for age. This is where most 2018 Mercedes Benz Clas sit.

⚠ Over 64,392 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2018 Mercedes Benz Cla — Still on the Road

Almost all 2018 Mercedes Benz Clas are still on the road.

Strong survival — 7,940 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 2021–2025.

MOT History Averages

5.9

Avg MOT tests per vehicle

0.86

Avg failures per vehicle

5.3

Avg advisories per vehicle

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

2013 2014 2015 2016 2017 2019 2020 2021 2022 2023

Or browse all models: Mercedes Benz →

Compare with another model

See how the 2018 Mercedes Benz Cla stacks up against a rival.

Watch for defects — worth knowing