Should I check the MOT history before buying a 2021 Audi A5 S Line 40 TDI MHEV Quat 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 A5 S Line 40 TDI MHEV Quat 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 A5 S Line 40 TDI MHEV Quat 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 A5 S Line 40 TDI MHEV Quat SA reliable?

Based on MOT data from 203 vehicles, the 2021 Audi A5 S Line 40 TDI MHEV Quat SA has a first-time MOT pass rate of 93.9%, 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 A5 S Line 40 TDI MHEV Quat 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 A5 S Line 40 TDI MHEV Quat SA (2021)

203 real MOT outcomes analysed • 93.9% first-time pass rate

2021 Audi A5 S Line 40 TDI MHEV Quat SA

CarHunch analysed 203 real MOT records for the 2021 Audi A5 S Line 40 TDI MHEV Quat SA. 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 Colour Breakdown Compare Models

This A5 S Line is notably reliable, with a first-time pass rate of 91.1% well above the UK average of 80%, and only 6.4% of vehicles have ever recorded a dangerous defect—a low safety concern. The modest failure rate of 0.19 per vehicle suggests these diesels are mechanically sound when they reach the test.

At just under 34,000 miles median mileage for a 2021 model, these cars are running light for their age, which partly explains the strong pass rate. The average of 1.6 advisories per vehicle points to minor wear items rather than structural problems—typical of a well-maintained premium diesel. If you're considering one, prioritise a full service history to confirm that early maintenance advantage has been maintained.

We have limited data for the 2021 Audi A5 S Line 40 TDI MHEV Quat SA — treat the figures below as indicative rather than definitive.

⚠️ 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

93.9%

UK average ~80%

Better than average

Dangerous (ever)

6.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.19

Over 2.2 tests on record

Low

Typical mileage

34k

Middle half: 27k–46k

For context

These stats describe 203 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 203 Audi A5 S Line 40 TDI MHEV Quat SA cars.

Before you buy a 2021 Audi A5 S Line 40 TDI MHEV Quat SA

Based on MOT data from 203 vehicles — here's what to check.

📋 Check the full MOT history. 6.4% 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

Colour Breakdown

Based on 928 Audi A5 S Line 40 TDI MHEV Quat SA vehicles registered in the UK — across all years. From DVLA registration records.

Grey 32.2%

299

Black 26.9%

250

White 20.8%

193

Blue 16.4%

152

Green 2.4%

Red 1.3%

Mileage Distribution

Most 2021 Audi A5 S Line 40 TDI MHEV Quat 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.

33,999

typical

26,721

low mileage

45,936

high mileage

Half of all 2021 Audi A5 S Line 40 TDI MHEV Quat SA vehicles fall between 26,721 and 45,936 miles.

Is the mileage you're seeing normal?

✓ Under 26,721 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.

✓ 26,721–45,936 miles — normal for age. This is where most 2021 Audi A5 S Line 40 TDI MHEV Quat SAs sit.

⚠ Over 62,013 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

2.2

Avg MOT tests per vehicle

0.19

Avg failures per vehicle

1.6

Avg advisories per vehicle

Other model years — Audi A5 S Line 40 TDI MHEV Quat SA: All A5 S Line 40 TDI MHEV Quat SA years → Which year to buy? →

2022 2023

Or browse all models: Audi →

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See how the 2021 Audi A5 S Line 40 TDI MHEV Quat SA stacks up against a rival.

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