Should I check the MOT history before buying a 2021 Audi Q4 E Tron S Line 40?

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 Q4 E Tron S Line 40?

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 Q4 E Tron S Line 40?

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 Q4 E Tron S Line 40 reliable?

Based on MOT data from 1,726 vehicles, the 2021 Audi Q4 E Tron S Line 40 has a first-time MOT pass rate of 92.2%, 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 Q4 E Tron S Line 40?

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 Q4 E Tron S Line 40 (2021)

1,726 real MOT outcomes analysed • 92.2% first-time pass rate

2021 Audi Q4 E Tron S Line 40

CarHunch analysed 1,726 real MOT records for the 2021 Audi Q4 E Tron S Line 40. 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 MOT Averages Colour Breakdown Compare Models

The 2021 Audi Q4 e-tron S Line 40 passes its MOT on the first attempt 90.8% of the time, well above the UK average of 80%, which suggests strong build quality and reliability for this relatively young electric SUV. Only 11.2% of vehicles in this cohort have ever recorded a dangerous defect, putting it in a reassuringly safe bracket for buyers.

At 35,041 miles average and 32,360 miles median, these cars are running slightly higher than typical for their age, yet they average just 0.24 failures per vehicle—indicating that even with decent mileage, they're holding up well. The 1.6 advisories per car suggest minor wear items are cropping up, so budget for brake fluid and suspension checks as preventative maintenance when buying used, rather than expecting serious repairs.

The 2021 Audi Q4 E Tron S Line 40 passes its MOT first time more often than most UK vehicles (92.2% 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

92.2%

UK average ~80%

Better than average

Dangerous (ever)

11.2%

At least once in MOT history

Check this vehicle

Avg failures / car

0.24

Over 2.2 tests on record

Low

Typical mileage

32k

Middle half: 25k–42k

For context

✅ Good baseline reliability. A 92.2% 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 1,726 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 1,726 Audi Q4 E Tron S Line 40 cars.

Before you buy a 2021 Audi Q4 E Tron S Line 40

Based on MOT data from 1,726 vehicles — here's what to check.

📋 Check the full MOT history. 11.2% 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 12,460 Audi Q4 E Tron S Line 40 vehicles registered in the UK — across all years. From DVLA registration records.

Grey 37.2%

4,634

Black 25.7%

3,199

Blue 22.1%

2,749

White 8.4%

1,044

Silver 4.3%

530

Purple 2.4%

304

Mileage Distribution

Most 2021 Audi Q4 E Tron S Line 40 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.

32,360

typical

25,054

low mileage

42,332

high mileage

Half of all 2021 Audi Q4 E Tron S Line 40 vehicles fall between 25,054 and 42,332 miles.

Is the mileage you're seeing normal?

✓ Under 25,054 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.

✓ 25,054–42,332 miles — normal for age. This is where most 2021 Audi Q4 E Tron S Line 40s sit.

⚠ Over 57,148 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

0.24

Avg failures per vehicle

1.6

Avg advisories per vehicle

Other model years — Audi Q4 E Tron S Line 40: All Q4 E Tron S Line 40 years → Which year to buy? →

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