Audi A4 reliability: B8 and B9 buying guide for dealers
Audi A4 reliability by generation and engine: TFSI oil use, TDI faults, multitronic and S tronic gearboxes, and what to check before buying.
· 7 min read
Audi A4 reliability is good overall, but it depends heavily on the engine and gearbox. The B9 (2015–2024) with a 2.0 TDI or later 2.0 TFSI is the safest stock; the B8 (2007–2015) is fine with the right combination, but early 1.8 and 2.0 TFSI petrols can burn oil and the multitronic CVT is the gearbox to avoid. Check these before you bid.
Audi A4 generations for dealers
The A4 generations you will meet as a dealer are the B8, built from 2007 to 2015 with a facelift in 2011–2012, and the B9, built from 2015 to 2024 with a facelift in 2019. Since 2024, Audi's successor in this size class is sold as the A5.
| Generation | Years | Main petrols | Main diesels | Gearboxes |
|---|---|---|---|---|
| B8 | 2007–2015 | 1.8 TFSI, 2.0 TFSI (EA888 Gen 2), 3.2 FSI | 2.0 TDI (EA189), 2.7/3.0 TDI | Manual, multitronic CVT, S tronic, tiptronic |
| B9 | 2015–2024 | 1.4 TFSI, 2.0 TFSI (35/40/45 TFSI) | 2.0 TDI (EA288), 3.0 TDI | Manual, S tronic, tiptronic (8-speed) |
Both generations were sold as a saloon and as the Avant estate, plus the raised allroad quattro. The mechanical risks are the same for all body styles; see our separate guide to A4 allroad reliability.
Audi A4 reliability: is it a good used car to stock?
Yes, the Audi A4 is a reliable used car to stock when you choose the right engine and gearbox and the car has a clear history. Most A4s in dealer stock are ex-company cars with high mileage, so a documented service record matters more than the badge.
According to listings tracked by MyCarDealer in Germany, the Netherlands, Belgium, Italy, Poland, France, Austria and Spain in October 2026:
| A4, model years | Listings | Median asking price | Median mileage |
|---|---|---|---|
| Diesel, 2009–2015 (B8) | 794 | €7,500 | 224,297 km |
| Petrol, 2009–2015 (B8) | 467 | €7,450 | 189,000 km |
| Diesel, 2016–2019 (B9) | 994 | €15,700 | 163,000 km |
| Petrol, 2016–2020 (B9) | 561 | €18,400 | 118,000 km |
The figures show how far A4 diesels go: B8 diesels were advertised with a median of more than 220,000 km. Petrol B8s are concentrated in the Netherlands, where 244 of the 467 listings were found, at a median of €7,450.
For car dealers
Know your margin before you buy
MyCarDealer compares any car from an auction or listing with the market in your country and shows the net margin after VAT, transport and costs – and the maximum bid.
Request accessWhich A4 engines have the most problems?
The A4 engines with the most problems are the B8's 1.8 and 2.0 TFSI petrols from the EA888 Gen 2 family, which can burn oil because of a piston-ring design issue, and the early common-rail 2.0 TDI, which has injector and emissions-system issues. Most other engines are considered durable with normal maintenance.
| Engine | Generation | Reputation | Main checks |
|---|---|---|---|
| 1.8 / 2.0 TFSI (EA888 Gen 2) | B8 up to about 2012 | Weakest | Oil consumption, chain tensioner |
| 2.0 TFSI (later versions) | B8 facelift, B9 | Good | Water pump, oil leaks |
| 1.4 TFSI | B9, 2016–2019 | Good | Normal checks |
| 2.0 TDI (EA189) | B8 | Good with caveats | Injectors, particulate filter, emissions software update |
| 2.0 TDI (EA288) | B9 | Good | AdBlue system on early cars, EGR |
| 3.0 TDI V6 | B8, B9 | Good but expensive to fix | Timing chain on early engines, injectors |
The TFSI oil consumption issue is covered in our guide to A4 TFSI reliability, and the diesels in our A4 2.0 TDI reliability guide.
Should I avoid the multitronic gearbox?
In most cases, yes. The multitronic CVT in front-wheel-drive B8 A4s is the A4's weakest component, with chain wear, slipping, judder from a standstill and control-unit failures that are expensive to repair. Specialist advice generally favours the 2013–2015 facelifted cars over earlier ones if you must buy a multitronic.
Signs of a tired multitronic:
- Judder or jerking when pulling away.
- Uneven acceleration or hesitation at low revs.
- Whining from the gearbox.
- Flashing gear indicator on the dashboard, a sign of a control-unit fault.
The S tronic dual-clutch gearbox replaced it in the B9 and was already fitted to quattro and some front-wheel-drive B8s. The seven-speed S tronic in many B8s (code 0B5 or DL501) has its own known mechatronic failures, which cause limp mode, harsh shifts and lost gears. Our guide to S tronic gearbox problems explains the checks. Manual gearboxes are the lowest-risk choice in both generations.
What are the most reliable years for the Audi A4?
The most reliable A4 years are generally the B9 from 2016 onwards, especially after the 2019 facelift, and the facelifted B8 from 2012–2015 with a later engine and a manual or S tronic gearbox. The years to treat with the most care are 2008–2011 B8 petrols and multitronic cars.
A practical ranking for stock:
- B9 2.0 TDI or 2.0 TFSI, 2019 onwards, with full history.
- B9 1.4 TFSI or 2.0 TDI, 2016–2019, with AdBlue system checked on diesels.
- B8 facelift 2.0 TDI, manual or S tronic, with documented injectors and particulate filter care.
- B8 early TFSI or multitronic only at a price that covers the risk.
What Audi A4 to stay away from?
The A4s to stay away from are early B8 TFSI petrols with high oil consumption and no record of piston repairs, multitronic cars with judder or warning lights, and high-mileage cars of any kind without service history. An A4 that has been modified with engine remaps or deleted emissions equipment should also be avoided, because it may not pass inspection or registration.
How many kilometres will an Audi A4 last?
A well-maintained A4 can cover well over 250,000 km, especially with a diesel engine and a manual or torque-converter gearbox. The listing data above shows that B8 diesels on sale had a median of more than 220,000 km, so high mileage alone is not a reason to reject a car.
What shortens an A4's life is not distance but neglect: long oil-change intervals, never-changed gearbox oil and ignored warning lights. For valuing cars past 200,000 km, see our guide to high-mileage car values.
Is the A4 Avant easier to sell than the saloon?
In most continental markets the A4 Avant is the easier car to sell, because estates are the default family and company car in Germany, Austria, Belgium, the Netherlands and Italy. The saloon sells too, but often more slowly and to a narrower group of buyers.
MyCarDealer values each A4 against comparable cars of the same generation, engine and year in your own country, so you can see the actual price difference between saloon and Avant where you sell. Start with a free valuation.
Frequently asked questions
What Audi A4 to stay away from?
Avoid early B8 1.8 and 2.0 TFSI petrols with high oil consumption and no piston repair, multitronic cars with judder or warning lights, and any car without service history. Remapped cars and cars with emissions equipment removed are also a risk.
Which Audi A4 engine is most reliable?
The B9 2.0 TDI (EA288) and later 2.0 TFSI engines are generally the most reliable, along with the B9 1.4 TFSI. In the B8, a well-maintained 2.0 TDI is usually a safer choice than the early TFSI petrols.
How many kilometres will an Audi A4 last?
With regular maintenance, an A4 can go well beyond 250,000 km, particularly with a diesel. B8 diesels advertised in October 2026 had a median mileage of over 220,000 km.
What are the most reliable years for the Audi A4?
B9 models from 2016, and especially after the 2019 facelift, are the most reliable. Among B8s, the 2012–2015 facelift with a later engine and a manual or S tronic gearbox is the better choice.
Should I avoid the multitronic gearbox?
Generally yes, unless the car is cheap enough to cover a repair. If you buy one, prefer a 2013–2015 car with documented gearbox oil changes and no judder from a standstill.