Should I check the MOT history before buying a 2021 Audi A3 S Line Comp 45 TFSI E 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 A3 S Line Comp 45 TFSI E 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 A3 S Line Comp 45 TFSI E 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 A3 S Line Comp 45 TFSI E SA reliable?

Based on MOT data from 334 vehicles, the 2021 Audi A3 S Line Comp 45 TFSI E SA has a first-time MOT pass rate of 93.3%, 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 A3 S Line Comp 45 TFSI E 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 A3 S Line Comp 45 TFSI E SA (2021)

334 real MOT outcomes analysed • 93.3% first-time pass rate

2021 Audi A3 S Line Comp 45 TFSI E SA

CarHunch analysed 334 real MOT records for the 2021 Audi A3 S Line Comp 45 TFSI E 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 Pass Rate by Fuel Mileage Distribution MOT Averages Colour Breakdown Compare Models

Moderate sample. 334 vehicles on record. Figures are indicative — the specific vehicle's history matters more than these averages.

This 2021 Audi A3 hybrid is significantly more reliable than the UK average, with a first-time pass rate of 92.1% against the national benchmark of 80%—a genuinely strong result. The dangerous defect rate of 11.4% is comfortably below the 20% threshold that would raise buyer concerns, so safety compliance isn't an issue here.

At 36,000 miles median (39,000 average), these cars are running fairly low mileage for their age, which tracks with the low failure rate of 0.21 per vehicle. The 1.7 advisories per test suggest minor wear items are starting to appear, but nothing systematic—if you're considering one, a pre-purchase inspection focusing on the hybrid battery health and brake system would be your smartest move.

The 2021 Audi A3 S Line Comp 45 TFSI E SA passes its MOT first time more often than most UK vehicles (93.3% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ About 1 in 12 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

93.3%

UK average ~80%

Better than average

Dangerous (ever)

11.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.21

Over 2.2 tests on record

Low

Typical mileage

36k

Middle half: 27k–49k

For context

✅ Good baseline reliability. A 93.3% 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 1.7 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 334 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 334 Audi A3 S Line Comp 45 TFSI E SA cars.

Before you buy a 2021 Audi A3 S Line Comp 45 TFSI E SA

Based on MOT data from 334 vehicles — here's what to check.

📋 Check the full MOT history. 11.4% 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
Hybrid Electric (Clean) (100%)	333	93.2%	0.21

Colour Breakdown

Based on 2,056 Audi A3 S Line Comp 45 TFSI E SA vehicles registered in the UK — across all years. From DVLA registration records.

Grey 26.9%

553

Blue 25%

515

White 22.2%

456

Black 21.6%

445

Red 2.6%

Yellow 1.7%

Mileage Distribution

Most 2021 Audi A3 S Line Comp 45 TFSI E 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.

36,072

typical

26,635

low mileage

48,876

high mileage

Half of all 2021 Audi A3 S Line Comp 45 TFSI E SA vehicles fall between 26,635 and 48,876 miles.

Is the mileage you're seeing normal?

✓ Under 26,635 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.

✓ 26,635–48,876 miles — normal for age. This is where most 2021 Audi A3 S Line Comp 45 TFSI E SAs sit.

⚠ Over 65,982 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

0.21

Avg failures per vehicle

1.7

Avg advisories per vehicle

Other model years — Audi A3 S Line Comp 45 TFSI E SA: All A3 S Line Comp 45 TFSI E SA years → Which year to buy? →

2022 2023 2024

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See how the 2021 Audi A3 S Line Comp 45 TFSI E SA stacks up against a rival.

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