Audi A4 TDI Reliability, MOT Pass Rate & Common Faults
Free Audi A4 TDI car check
Is the Audi A4 TDI reliable? We analysed 1,750 real MOT tests across 522 vehicles to find out.
Got a specific Audi A4 TDI? Enter the reg for a free check:
The Audi A4 TDI is about average for reliability based on real UK MOT data. Common problems include coil spring broken, tyre has a cut in excess of the requirements deep enough to reach the ply or cords and tyre has a lump, caused by separation or partial failure of its structure. Here's everything you need to know before buying a used Audi A4 TDI.
Audi A4 TDI Number Plates
Number plates registered to a Audi A4 TDI. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Audi A4 TDI MOT Pass Rate by Year
How likely is a Audi A4 TDI to pass its MOT? Here's the pass rate for each registration year, newest first.
Audi A4 TDI Problems — What Goes Wrong?
The most common reasons a Audi A4 TDI fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Audi A4 TDI Common Faults & Problems
These are the most common serious faults found on Audi A4 TDI models during MOT testing — flagged as dangerous or major failures that need immediate attention.
Audi A4 TDI Mileage — What's Normal?
How many miles does a typical Audi A4 TDI owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Audi A4 TDI MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Audi A4 TDI year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2011 | 63 | 74.6% | 54,968 | 81,169 | 113,253 |
Audi A4 TDI Mileage Distribution
Total mileage recorded across all Audi A4 TDI MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Audi A4 TDI
Based on MOT pass rates across all registration years with sufficient test data.
74.6% MOT pass rate from 63 tests
The best year to buy a used Audi A4 TDI is 2011, which has the highest MOT pass rate at 74.6% across 63 tests.
How Does the Audi A4 TDI Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Audi A4 TDI THIS CAR | 74.0% | 1,750 | 163,814 mi | 15 yrs |
| Audi A3 | 78% | 7,415,025 | 78,776 mi | 29 yrs |
| Audi A4 | 76.1% | 7,096,957 | 96,834 mi | 31 yrs |
| Audi A6 | 78.4% | 2,724,792 | 98,890 mi | 31 yrs |
| Honda Cbr 600 Rr-a | 88.1% | 2,450 | 10,105 mi | 17 yrs |
Compared to the Audi A3 (78.0% pass rate) and the Audi A4 (76.1% pass rate), the Audi A4 TDI trails behind on MOT reliability.
Found a Audi A4 TDI you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Audi A4 TDIShould you buy a used Audi A4 TDI?
The Audi A4 TDI has an overall MOT pass rate of 74.0% across 1,750 real MOT tests — roughly in line with the UK average.
The most common problems on the Audi A4 TDI are coil spring broken (2 recorded failures), tyre has a cut in excess of the requirements deep enough to reach the ply or cords (1), and tyre has a lump, caused by separation or partial failure of its structure (1). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
On the safety side, the most frequently flagged dangerous fault is tyre tread depth below requirements of 1.6mm. Dangerous faults cause an immediate MOT failure and mean the vehicle is not roadworthy until repaired. If you're viewing a Audi A4 TDI with an expired or recently passed MOT, ask the seller whether any dangerous faults were found and fixed during the last test.
A typical Audi A4 TDI owner drives around 7,401 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Audi A4 TDI models stay on UK roads for around 15 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.