Should I check the MOT history before buying a 2021 Audi A3 S Line 35 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 35 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 35 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 35 TFSI MHEV S A reliable?

Based on MOT data from 3,529 vehicles, the 2021 Audi A3 S Line 35 TFSI MHEV S A has a first-time MOT pass rate of 93.7%, 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 35 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 35 TFSI MHEV S A (2021)

3,529 real MOT outcomes analysed • 93.7% first-time pass rate

2021 Audi A3 S Line 35 TFSI MHEV S A

CarHunch analysed 3,529 real MOT records for the 2021 Audi A3 S Line 35 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

This A3 S Line is significantly more reliable than the UK average, with a first-time MOT pass rate of 92.2% compared to 80% nationally—a genuinely strong result. The dangerous defect rate sits at 8.9%, which is well below concerning levels, so structural and safety issues are rare in this cohort.

At a median mileage of 28,112 miles for a 2021 model, these cars are running low and showing it: the average vehicle has picked up only 0.2 failures and 1.6 advisories per test, indicating predictable wear rather than serious mechanical trouble. Check the service history and fluid condition when viewing one, as these cars are young enough that neglected maintenance is the main failure risk rather than age-related decline.

The 2021 Audi A3 S Line 35 TFSI MHEV S A passes its MOT first time more often than most UK vehicles (93.7% 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

93.7%

UK average ~80%

Better than average

Dangerous (ever)

8.9%

At least once in MOT history

Check this vehicle

Avg failures / car

0.2

Over 2.3 tests on record

Low

Typical mileage

28k

Middle half: 21k–36k

For context

✅ Good baseline reliability. A 93.7% 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 1.6 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 3,529 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 3,529 Audi A3 S Line 35 TFSI MHEV S A cars.

Before you buy a 2021 Audi A3 S Line 35 TFSI MHEV S A

Based on MOT data from 3,529 vehicles — here's what to check.

📋 Check the full MOT history. 8.9% 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%)	3,458	93.6%	0.2
Other (2%)	58	99.1%	0.02

Colour Breakdown

Based on 18,299 Audi A3 S Line 35 TFSI MHEV S A vehicles registered in the UK — across all years. From DVLA registration records.

Grey 32.7%

5,987

Black 24.8%

4,531

Blue 20.6%

3,762

White 17.7%

3,230

Red 2.3%

413

Green 1.6%

286

Yellow 0.5%

Mileage Distribution

Most 2021 Audi A3 S Line 35 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.

28,112

typical

20,787

low mileage

36,411

high mileage

Half of all 2021 Audi A3 S Line 35 TFSI MHEV S A vehicles fall between 20,787 and 36,411 miles.

Is the mileage you're seeing normal?

✓ Under 20,787 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.

✓ 20,787–36,411 miles — normal for age. This is where most 2021 Audi A3 S Line 35 TFSI MHEV S As sit.

⚠ Over 49,154 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

0.2

Avg failures per vehicle

1.6

Avg advisories per vehicle

Other model years — Audi A3 S Line 35 TFSI MHEV S A: All A3 S Line 35 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 35 TFSI MHEV S A stacks up against a rival.

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