Audi A4 (2020)
2020 Audi A4
CarHunch analysed 6,049 real MOT records for the 2020 Audi A4. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2020 Audi A4 passes its MOT on first attempt 88% of the time, comfortably ahead of the UK average of 80%, which suggests solid build quality and owner maintenance. Petrol models perform noticeably better at 89.9% pass rate versus diesel at 84.8%, and while 16.6% have experienced a dangerous defect, this isn't unusually high for the segment.
These cars are running at a median of 32,667 miles for their age, which is reasonable, and they average just 0.36 failures per test—meaning most that fail do so on minor issues rather than critical faults. The typical advisory count of 2.8 items per test suggests you'll encounter wear-related consumables rather than structural problems, so focus your pre-purchase inspection on service history and any patterns of electrical warnings on the dashboard.
Petrol vs Diesel
Pass rate difference of 5.1 percentage points — worth knowing if you're choosing between the two.
What to check before buying a 2020 Audi A4
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Audi A4
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (64%) | 3,858 | 89.9% | 0.36 |
| Diesel (36%) | 2,190 | 84.8% | 0.37 |
| Hybrid Electric (Clean) (0%) | 1 | 0% | 0 |
Mileage Distribution
Most 2020 Audi A4 vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2020 Audi A4 vehicles fall between 24,750 and 41,947 miles.
2020 Audi A4 — Still on the Road
Strong survival — 5,545 vehicles still getting MOTs in 2025, 98% of the peak.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2022–2025.
MOT History Averages
Most Common MOT Issues — 2020 Audi A4
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
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28.9%
Nearside Front Tyre worn close to legal limit/worn on edge
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28.3%
Offside Front Tyre worn close to legal limit/worn on edge
-
18%
Rear Brake pad(s) wearing thin
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15.9%
Nearside Rear Tyre worn close to legal limit/worn on edge
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15.3%
Front Brake pad(s) wearing thin
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14.8%
Offside Rear Tyre worn close to legal limit/worn on edge
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8.7%
Nearside Rear Child Seat fitted not allowing full inspection of adult belt ()
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7%
Front Brake disc worn, pitted or scored, but not seriously weakened
Data covers a 3-year window centred on 2020. Counts include advisories and failures.
Found a specific Audi A4?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.