Should I check the MOT history before buying a 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA?

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 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA?

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 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA?

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 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA reliable?

Based on MOT data from 149 vehicles, the 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA has a first-time MOT pass rate of 89.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA?

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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Audi A4 S Ln Blk Ed 40tdi MHEV Q SA (2021)

149 real MOT outcomes analysed • 89.2% first-time pass rate

2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA

CarHunch analysed 149 real MOT records for the 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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This 2021 A4 S line diesel is outperforming the UK average with an 85.6% first-time pass rate against the national 80%, suggesting these cars are holding up well mechanically. However, 16.8% have recorded a dangerous defect at some point, which is worth noting if you're buying used—get a pre-purchase inspection focused on brake and suspension components.

At 38,900 miles median (42,500 average), these vehicles are running relatively light for their age, which explains the strong pass rate but also means you're not yet seeing long-term wear patterns. Most cars rack up only 0.33 failures per test but average 1.6 advisories each, pointing to minor wear rather than structural problems—typical for a well-built premium diesel that benefits from owner maintenance. When shopping, ask for full service history and a recent MOT printout to check what advisories have been flagged.

We have limited data for the 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA — 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

89.2%

UK average ~80%

Better than average

Dangerous (ever)

16.8%

At least once in MOT history

Check this vehicle

Avg failures / car

0.33

Over 2.3 tests on record

Low

Typical mileage

39k

Middle half: 29k–53k

For context

These stats describe 149 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 149 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA cars.

Before you buy a 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA

Based on MOT data from 149 vehicles — here's what to check.

📋 Check the full MOT history. 16.8% 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 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA 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.

38,868

typical

28,781

low mileage

53,344

high mileage

Half of all 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SA vehicles fall between 28,781 and 53,344 miles.

Is the mileage you're seeing normal?

✓ Under 28,781 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.

✓ 28,781–53,344 miles — normal for age. This is where most 2021 Audi A4 S Ln Blk Ed 40tdi MHEV Q SAs sit.

⚠ Over 72,014 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

2.3

Avg MOT tests per vehicle

0.33

Avg failures per vehicle

1.6

Avg advisories per vehicle

Other model years — Audi A4 S Ln Blk Ed 40tdi MHEV Q SA: All A4 S Ln Blk Ed 40tdi MHEV Q SA years → Which year to buy? →

2022 2023 2024

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Average reliability — agree?