Audi A4 (2021)
2021 Audi A4
CarHunch analysed 164 real MOT records for the 2021 Audi A4. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2021 Audi A4 is significantly more reliable than the UK average, with a 91.3% first-time pass rate compared to 80% across all vehicles—and only 9.2% have ever recorded a dangerous defect, which is well below concerning levels. Petrol models perform consistently well at 90.5%, so fuel type isn't a reliability differentiator here.
At 26,380 miles median, these cars are still relatively low-mileage for their age, suggesting gentle use across the tested population and minimal wear concerns. The 0.2 average failures per vehicle and 1.2 advisories point to a mechanically sound cohort—if you're buying one, get a full service history check and have a pre-purchase inspection focus on suspension wear and electrical systems, where advisories tend to cluster on this model.
What to check before buying a 2021 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 (87%) | 143 | 90.5% | 0.21 |
| Diesel (12%) | 20 | 96.7% | 0.1 |
| Hybrid Electric (Clean) (1%) | 1 | 100% | 0 |
Mileage Distribution
Most 2021 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 2021 Audi A4 vehicles fall between 20,148 and 36,598 miles.
MOT History Averages
Most Common MOT Issues — 2021 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
-
15.3%
Front Brake pad(s) wearing thin
-
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 2021. 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.