Audi A5 S Line TDI (2015)
2015 Audi A5 S Line TDI
CarHunch analysed 194 real MOT records for the 2015 Audi A5 S Line TDI. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2015 Audi A5 S Line TDI is a below-average performer, with just 63.7% passing MOT first time against the UK average of 80%—that's a significant gap suggesting these cars need more remedial work than typical. The good news is no dangerous defects have been recorded across the 194 vehicles analysed, so while reliability issues exist, they're not safety-critical.
At 94,216 miles on average, these cars have typical mileage for their age, yet they're still accumulating 0.41 failures per test, pointing to wear-related gremlins rather than design flaws. If you're considering one, budget for a pre-purchase inspection by a diesel specialist, as the TDI engine and emissions systems are common failure points on this generation.
What to check before buying a 2015 Audi A5 S Line TDI
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 A5 S Line TDI
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Diesel (97%) | 189 | 63.1% | 0.41 |
| Gas Bi-Fuel (2%) | 3 | 94.4% | 0.33 |
| Other (1%) | 1 | 100% | 0 |
| Diesel (1%) | 1 | 50% | 1 |
Mileage Distribution
Most 2015 Audi A5 S Line TDI 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 2015 Audi A5 S Line TDI vehicles fall between 77,459 and 110,350 miles.
2015 Audi A5 S Line TDI — Still on the Road
Strong survival — 115 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 2019–2025.
MOT History Averages
Found a specific Audi A5 S Line TDI?
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