Audi A4 S Line TFSI (2018)
2018 Audi A4 S Line TFSI
CarHunch analysed 148 real MOT records for the 2018 Audi A4 S Line TFSI. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2018 Audi A4 S Line TFSI has a first-time MOT pass rate of just 57.7%, well below the UK average of 80%, which signals meaningful reliability concerns for this generation. The good news is that dangerous defects are entirely absent from this cohort, so safety isn't the issue—instead, you're looking at a car prone to smaller but frequent failures that require attention.
At a median mileage of 47,371 miles for a six-year-old car, these vehicles are running at typical wear patterns, yet they're still presenting problems at every test; the 0.16 average failures per vehicle suggests nagging issues rather than catastrophic ones. Before buying, get an independent pre-purchase inspection focusing on the common failure points for this generation—typically electronics, emissions systems, and suspension wear—rather than relying on a recent MOT pass alone.
What to check before buying a 2018 Audi A4 S Line TFSI
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 TFSI
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 |
|---|---|---|---|
| Other (61%) | 91 | 93.8% | 0.25 |
| Petrol (39%) | 57 | 0% | 0 |
Mileage Distribution
Most 2018 Audi A4 S Line TFSI 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 2018 Audi A4 S Line TFSI vehicles fall between 35,986 and 57,190 miles.
2018 Audi A4 S Line TFSI — Still on the Road
46 vehicles still getting MOTs in 2025 — 62% of the peak remain.
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
Found a specific Audi A4 S Line TFSI?
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