Audi A4 SE Ultra TDI (2018)
2018 Audi A4 SE Ultra TDI
CarHunch analysed 123 real MOT records for the 2018 Audi A4 SE Ultra TDI. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
This 2018 Audi A4 SE Ultra TDI has a first-time pass rate of 77.5%, sitting just below the UK average of 80%, which suggests broadly reliable performance but with slightly more teething issues than the typical car its age. The good news is that no vehicles in this cohort have ever recorded a dangerous defect, so structural and safety-critical failures are not a concern here.
At a median mileage of 78,285 miles for a six-year-old car, these examples are right in the sweet spot for age, and the low failure rate of 0.14 per vehicle indicates that when problems do crop up, they tend to be minor rather than systemic. Before buying, have a pre-purchase inspection focus on the diesel engine's emissions control systems and gearbox health, as these are where TDI models of this generation commonly show wear.
What to check before buying a 2018 Audi A4 SE Ultra 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 A4 SE Ultra TDI
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Diesel (98%) | 121 | 77.2% | 0.14 |
| Diesel (1%) | 1 | 100% | 0 |
| Gas Bi-Fuel (1%) | 1 | 100% | 0 |
Mileage Distribution
Most 2018 Audi A4 SE Ultra 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 2018 Audi A4 SE Ultra TDI vehicles fall between 63,594 and 87,323 miles.
2018 Audi A4 SE Ultra TDI — Still on the Road
40 vehicles still getting MOTs in 2025 — 57% 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 SE Ultra TDI?
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