Should I check the MOT history before buying a 2021 Audi A4 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 A4 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 A4 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 A4 S Line 35 TFSI MHEV S A reliable?

Based on MOT data from 298 vehicles, the 2021 Audi A4 S Line 35 TFSI MHEV S A has a first-time MOT pass rate of 92%, 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 A4 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 A4 S Line 35 TFSI MHEV S A (2021)

298 real MOT outcomes analysed • 92% first-time pass rate

2021 Audi A4 S Line 35 TFSI MHEV S A

CarHunch analysed 298 real MOT records for the 2021 Audi A4 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 2021 A4 S Line is a solid performer, with a first-time MOT pass rate of 91.1%—well above the UK average of 80%—and only 13.8% of vehicles ever flagged with a dangerous defect, which is reassuringly low. The petrol variant passes at 90.8%, suggesting consistent reliability across the small sample.

At a median mileage of just over 30,000 miles for a three-year-old car, these examples have been gently used, yet they still average 0.26 failures and 1.7 advisories per test, indicating minor wear rather than serious mechanical problems. Before committing to a purchase, have a pre-buy inspection focus on the suspension and electrical systems—the areas where most advisories cluster on this generation—to catch issues before they become costly.

We have limited data for the 2021 Audi A4 S Line 35 TFSI MHEV S A — treat the figures below as indicative rather than definitive.

⚠️ 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

92%

UK average ~80%

Better than average

Dangerous (ever)

13.8%

At least once in MOT history

Check this vehicle

Avg failures / car

0.26

Over 2.3 tests on record

Low

Typical mileage

30k

Middle half: 22k–39k

For context

These stats describe 298 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 298 Audi A4 S Line 35 TFSI MHEV S A cars.

Before you buy a 2021 Audi A4 S Line 35 TFSI MHEV S A

Based on MOT data from 298 vehicles — here's what to check.

📋 Check the full MOT history. 13.8% 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%)	291	91.8%	0.26

Colour Breakdown

Based on 4,175 Audi A4 S Line 35 TFSI MHEV S A vehicles registered in the UK — across all years. From DVLA registration records.

Grey 32.1%

1,340

Black 24.1%

1,008

White 23.3%

972

Blue 18.2%

758

Green 1.5%

Red 0.8%

Mileage Distribution

Most 2021 Audi A4 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.

30,286

typical

21,730

low mileage

38,898

high mileage

Half of all 2021 Audi A4 S Line 35 TFSI MHEV S A vehicles fall between 21,730 and 38,898 miles.

Is the mileage you're seeing normal?

✓ Under 21,730 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.

✓ 21,730–38,898 miles — normal for age. This is where most 2021 Audi A4 S Line 35 TFSI MHEV S As sit.

⚠ Over 52,512 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

0.26

Avg failures per vehicle

1.7

Avg advisories per vehicle

Other model years — Audi A4 S Line 35 TFSI MHEV S A: All A4 S Line 35 TFSI MHEV S A years → Which year to buy? →

2022 2023 2024

Or browse all models: Audi →

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See how the 2021 Audi A4 S Line 35 TFSI MHEV S A stacks up against a rival.

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