Audi A4 S Line TDI (2009)
2009 Audi A4 S Line TDI
CarHunch analysed 553 real MOT records for the 2009 Audi A4 S Line TDI.
Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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This 2009 Audi A4 S Line TDI diesel is a reliability concern: only 59.1% pass their MOT first time, significantly below the UK average of 80%, and owners are logging an average of 1.02 failures per vehicle. The good news is that dangerous defects are extremely rare at 0%, so while these cars need more maintenance work, they're not failing for safety-critical reasons.
With a median mileage of 138,108 miles for a 15-year-old car, these examples are running hard but not unusually so. The near-zero advisory count suggests that when this engine and chassis do develop faults, they tend to be definitive failures rather than emerging problems—meaning you'll face bills for worn components rather than warning signs to ignore. If you're considering one, budget for a pre-purchase inspection by a diesel specialist and expect regular maintenance costs; these aren't cars to buy cheap and hope for the best.
The 2009 Audi A4 S Line TDI passes its MOT first time at roughly the UK average rate (80.3%) — solid but worth checking this vehicle's history carefully.
These stats describe 553 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.
See this vehicle's full MOT history & AI hunches
Spot recurring advisories, hidden issues, and how it compares to 553 Audi A4 S Line TDI cars.
Before you buy a 2009 Audi A4 S Line TDI
Based on MOT data from 553 vehicles — here's what to check.
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Check the full MOT history.
0% of these vehicles have had a dangerous defect recorded -
recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle. -
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Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price.
Inspection
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Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically.
History
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Diesel (99%) | 546 | 80.3% | 1.02 |
Colour Breakdown
Based on 4,486 Audi A4 S Line TDI vehicles registered in the UK — across all years. From DVLA registration records.
Mileage Distribution
Most 2009 Audi A4 S Line TDI vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2009 Audi A4 S Line TDI vehicles fall between 119,032 and 155,443 miles.
2009 Audi A4 S Line TDI — Still on the Road
Numbers are thinning — 58% of 2009 Audi A4 S Line TDIs are still active.
195 vehicles still getting MOTs in 2025 — 58% of the peak remain.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2017–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.
MOT History Averages
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