Should I check the MOT history before buying a 2020 Audi A4 S Line 30 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 2020 Audi A4 S Line 30 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 2020 Audi A4 S Line 30 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 2020 Audi A4 S Line 30 TDI S A reliable?

Based on MOT data from 158 vehicles, the 2020 Audi A4 S Line 30 TDI S A has a first-time MOT pass rate of 89.6%, 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 2020 Audi A4 S Line 30 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 A4 S Line 30 TDI S A (2020)

158 real MOT outcomes analysed • 89.6% first-time pass rate

2020 Audi A4 S Line 30 TDI S A

CarHunch analysed 158 real MOT records for the 2020 Audi A4 S Line 30 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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Reliability Overview Check a Specific Reg Buyer's Checklist Mileage Distribution Still on the Road MOT Averages Compare Models

Limited data for this trim variant. The DVLA records this vehicle under a specific trim-level name with only 158 vehicles on record — some statistics may not be reliable at this sample size.

See the full 2020 AUDI A4 (6,049 vehicles)

We have limited data for the 2020 Audi A4 S Line 30 TDI 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

89.6%

UK average ~80%

Better than average

Dangerous (ever)

18.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.43

Over 3.2 tests on record

Low

Typical mileage

47k

Middle half: 37k–61k

For context

These stats describe 158 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.

Average reliability — agree?

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 158 Audi A4 S Line 30 TDI S A cars.

Before you buy a 2020 Audi A4 S Line 30 TDI S A

Based on MOT data from 158 vehicles — here's what to check.

📋 Check the full MOT history. 18.4% 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

Mileage Distribution

Most 2020 Audi A4 S Line 30 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.

46,839

typical

37,276

low mileage

60,508

high mileage

Half of all 2020 Audi A4 S Line 30 TDI S A vehicles fall between 37,276 and 60,508 miles.

Is the mileage you're seeing normal?

✓ Under 37,276 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.

✓ 37,276–60,508 miles — normal for age. This is where most 2020 Audi A4 S Line 30 TDI S As sit.

⚠ Over 81,685 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2020 Audi A4 S Line 30 TDI S A — Still on the Road

Almost all 2020 Audi A4 S Line 30 TDI S As are still on the road.

Strong survival — 129 vehicles still getting MOTs in 2025, 92% 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

3.2

Avg MOT tests per vehicle

0.43

Avg failures per vehicle

2.7

Avg advisories per vehicle

Compare with another model

See how the 2020 Audi A4 S Line 30 TDI S A stacks up against a rival.

Average reliability — agree?