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

Based on MOT data from 348 vehicles, the 2021 Audi A3 S Line 35 TDI S A has a first-time MOT pass rate of 91.8%, 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 TDI 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 TDI S A (2021)

348 real MOT outcomes analysed • 91.8% first-time pass rate

2021 Audi A3 S Line 35 TDI S A

CarHunch analysed 348 real MOT records for the 2021 Audi A3 S Line 35 TDI 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 Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

Moderate sample. 348 vehicles on record. Figures are indicative — the specific vehicle's history matters more than these averages.

This 2021 A3 S Line 35 TDI is above average for reliability, with an 89.1% first-time MOT pass rate against the UK average of 80%, though the 12.6% of vehicles that have recorded a dangerous defect is worth noting for a prospective buyer. The diesel engine appears solid on these figures, with low failure rates suggesting the mechanicals are holding up well.

At around 38,000 miles median for a three-year-old car, these examples have been run fairly gently, yet they're still picking up an average of 1.8 advisories per test—mostly minor wear items rather than serious faults. If you're considering one, have a pre-purchase inspection focus on the suspension and braking components, which tend to be the most common advisory items on this model.

The 2021 Audi A3 S Line 35 TDI S A passes its MOT first time more often than most UK vehicles (91.8% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ 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

91.8%

UK average ~80%

Better than average

Dangerous (ever)

12.6%

At least once in MOT history

Check this vehicle

Avg failures / car

0.27

Over 2.3 tests on record

Low

Typical mileage

38k

Middle half: 29k–51k

For context

✅ Good baseline reliability. A 91.8% 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 348 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 348 Audi A3 S Line 35 TDI S A cars.

Before you buy a 2021 Audi A3 S Line 35 TDI S A

Based on MOT data from 348 vehicles — here's what to check.

📋 Check the full MOT history. 12.6% 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 2,894 Audi A3 S Line 35 TDI S A vehicles registered in the UK — across all years. From DVLA registration records.

Grey 33.2%

960

Black 28.9%

835

Blue 18%

520

White 17.1%

496

Red 1.8%

Green 0.9%

Yellow 0.2%

Mileage Distribution

Most 2021 Audi A3 S Line 35 TDI 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.

38,393

typical

28,631

low mileage

51,241

high mileage

Half of all 2021 Audi A3 S Line 35 TDI S A vehicles fall between 28,631 and 51,241 miles.

Is the mileage you're seeing normal?

✓ Under 28,631 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.

✓ 28,631–51,241 miles — normal for age. This is where most 2021 Audi A3 S Line 35 TDI S As sit.

⚠ Over 69,175 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2021 Audi A3 S Line 35 TDI S A — Still on the Road

Almost all 2021 Audi A3 S Line 35 TDI S As are still on the road.

Strong survival — 322 vehicles still getting MOTs in 2025, 100% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.

MOT History Averages

2.3

Avg MOT tests per vehicle

0.27

Avg failures per vehicle

1.8

Avg advisories per vehicle

Other model years — Audi A3 S Line 35 TDI S A: All A3 S Line 35 TDI S A years → Which year to buy? →

2020 2022 2023 2024 2025

Or browse all models: Audi →

Compare with another model

See how the 2021 Audi A3 S Line 35 TDI S A stacks up against a rival.

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