Should I check the MOT history before buying a 2021 Audi A3 S Line 30 TFSI MHEV S A?

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 30 TFSI MHEV S A?

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 30 TFSI MHEV S A?

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 30 TFSI MHEV S A reliable?

Based on MOT data from 1,004 vehicles, the 2021 Audi A3 S Line 30 TFSI MHEV S A has a first-time MOT pass rate of 93%, 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 30 TFSI MHEV S A?

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 30 TFSI MHEV S A (2021)

1,004 real MOT outcomes analysed • 93% first-time pass rate

2021 Audi A3 S Line 30 TFSI MHEV S A

CarHunch analysed 1,004 real MOT records for the 2021 Audi A3 S Line 30 TFSI MHEV S A. 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

The 2021 Audi A3 S Line 30 TFSI MHEV is a strong performer on the MOT bench, with a 91.2% first-time pass rate that substantially beats the UK average of 80%—this hybrid petrol variant is proving notably reliable in early life. The dangerous defect rate of 9.9% is reassuringly low, suggesting no systemic safety concerns for prospective buyers.

These vehicles are averaging just over 31,000 miles at test time, which is spot-on for a three-year-old car, and they're failing on less than a quarter of a defect per test on average. When problems do show up, they tend to be minor advisories (1.8 per vehicle on average) rather than serious failures, so budget for routine maintenance but don't expect costly surprises—just get a full pre-purchase inspection to confirm service history, as that's what keeps these cars ticking.

The 2021 Audi A3 S Line 30 TFSI MHEV S A passes its MOT first time more often than most UK vehicles (93% 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%

UK average ~80%

Better than average

Dangerous (ever)

9.9%

At least once in MOT history

Check this vehicle

Avg failures / car

0.22

Over 2.3 tests on record

Low

Typical mileage

29k

Middle half: 22k–37k

For context

✅ Good baseline reliability. A 93% 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 1.8 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 1,004 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 1,004 Audi A3 S Line 30 TFSI MHEV S A cars.

Before you buy a 2021 Audi A3 S Line 30 TFSI MHEV S A

Based on MOT data from 1,004 vehicles — here's what to check.

📋 Check the full MOT history. 9.9% 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 (98%)	980	92.9%	0.22

Colour Breakdown

Based on 7,542 Audi A3 S Line 30 TFSI MHEV S A vehicles registered in the UK — across all years. From DVLA registration records.

Grey 34.1%

2,570

Black 27.7%

2,092

White 18.5%

1,396

Blue 16.5%

1,244

Red 1.5%

115

Green 0.8%

Yellow 0.8%

Mileage Distribution

Most 2021 Audi A3 S Line 30 TFSI MHEV S A 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.

28,555

typical

21,514

low mileage

37,403

high mileage

Half of all 2021 Audi A3 S Line 30 TFSI MHEV S A vehicles fall between 21,514 and 37,403 miles.

Is the mileage you're seeing normal?

✓ Under 21,514 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.

✓ 21,514–37,403 miles — normal for age. This is where most 2021 Audi A3 S Line 30 TFSI MHEV S As sit.

⚠ Over 50,494 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

0.22

Avg failures per vehicle

1.8

Avg advisories per vehicle

Other model years — Audi A3 S Line 30 TFSI MHEV S A: All A3 S Line 30 TFSI MHEV S A years → Which year to buy? →

2020 2022 2023 2024 2025

Or browse all models: Audi →

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See how the 2021 Audi A3 S Line 30 TFSI MHEV S A stacks up against a rival.

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