Should I check the MOT history before buying a 2020 Audi S4 TDI Quattro Auto?

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 S4 TDI Quattro Auto?

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 S4 TDI Quattro Auto?

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 S4 TDI Quattro Auto reliable?

Based on MOT data from 233 vehicles, the 2020 Audi S4 TDI Quattro Auto 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 2020 Audi S4 TDI Quattro Auto?

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 S4 TDI Quattro Auto (2020)

233 real MOT outcomes analysed • 93.7% first-time pass rate

2020 Audi S4 TDI Quattro Auto

CarHunch analysed 233 real MOT records for the 2020 Audi S4 TDI Quattro Auto. 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 Still on the Road MOT Averages Colour Breakdown Compare Models

The 2020 Audi S4 TDI Quattro Auto is a strong performer at MOT, with a 91.3% first-time pass rate that sits 11 points above the UK average of 80%—and this reliability advantage holds across the diesel-only lineup. Fewer than 1 in 10 vehicles have ever recorded a dangerous defect, so safety concerns are minimal.

With a median mileage of 38,759 miles, these cars are running relatively light for four-year-old vehicles, suggesting either careful ownership or limited use. The low failure rate of 0.26 per vehicle and modest advisory count of 2.2 indicate this is a mechanically sound car if you find one with decent service history, but you should still budget for the typical premium maintenance costs of an Audi performance diesel.

We have limited data for the 2020 Audi S4 TDI Quattro Auto — treat the figures below as indicative rather than definitive.

⚠️ 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)

10.3%

At least once in MOT history

Check this vehicle

Avg failures / car

0.26

Over 3.1 tests on record

Low

Typical mileage

39k

Middle half: 30k–51k

For context

These stats describe 233 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 233 Audi S4 TDI Quattro Auto cars.

Before you buy a 2020 Audi S4 TDI Quattro Auto

Based on MOT data from 233 vehicles — here's what to check.

📋 Check the full MOT history. 10.3% 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
Diesel (100%)	232	93.7%	0.26

Colour Breakdown

Based on 359 Audi S4 TDI Quattro Auto vehicles registered in the UK — across all years. From DVLA registration records.

Grey 34.3%

123

Blue 29%

104

Black 18.9%

White 13.9%

Red 3.9%

Mileage Distribution

Most 2020 Audi S4 TDI Quattro Auto 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.

38,759

typical

30,098

low mileage

50,887

high mileage

Half of all 2020 Audi S4 TDI Quattro Auto vehicles fall between 30,098 and 50,887 miles.

Is the mileage you're seeing normal?

✓ Under 30,098 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.

✓ 30,098–50,887 miles — normal for age. This is where most 2020 Audi S4 TDI Quattro Autos sit.

⚠ Over 68,697 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 S4 TDI Quattro Auto — Still on the Road

Almost all 2020 Audi S4 TDI Quattro Autos are still on the road.

Strong survival — 203 vehicles still getting MOTs in 2025, 97% 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

3.1

Avg MOT tests per vehicle

0.26

Avg failures per vehicle

2.2

Avg advisories per vehicle

Other model years — Audi S4 TDI Quattro Auto: All S4 TDI Quattro Auto years → Which year to buy? →

2019

Or browse all models: Audi →

Compare with another model

See how the 2020 Audi S4 TDI Quattro Auto stacks up against a rival.

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