Audi A4 S Line Blk Ed 35 TFSI MHEV (2021)
2021 Audi A4 S Line Blk Ed 35 TFSI MHEV
CarHunch analysed 464 real MOT records for the 2021 Audi A4 S Line Blk Ed 35 TFSI MHEV. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
This 2021 Audi A4 S Line is significantly more reliable than the UK average, with a 91.6% first-time pass rate well above the 80% benchmark—a genuinely strong result. The 12.5% dangerous defect rate is acceptable and not a major buyer concern for this model.
At 30,362 miles median, these cars are running relatively light for their age, and they're averaging just 0.22 failures per vehicle, suggesting the petrol engine is holding up well. With 1.6 advisories per car on average, expect minor wear items rather than structural problems; have the brake fluid and cabin filter checked during your first service, as these are typical early advisories on this generation.
What to check before buying a 2021 Audi A4 S Line Blk Ed 35 TFSI MHEV
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 S Line Blk Ed 35 TFSI MHEV
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (98%) | 454 | 91.5% | 0.23 |
| Other (2%) | 7 | 100% | 0 |
| Hybrid Electric (Clean) (1%) | 3 | 88.9% | 0.33 |
Mileage Distribution
Most 2021 Audi A4 S Line Blk Ed 35 TFSI MHEV 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 S Line Blk Ed 35 TFSI MHEV vehicles fall between 23,658 and 40,247 miles.
2021 Audi A4 S Line Blk Ed 35 TFSI MHEV — Still on the Road
Strong survival — 454 vehicles still getting MOTs in 2025, 100% 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
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