Audi
Audi A4
Explore the Audi A4's reliability, common issues, and buying tips to decide with confidence on this premium saloon.

In short
The Audi A4 is a premium compact executive car that appeals to those seeking a blend of performance, comfort, and technology. Currently in its fifth generation (B9), launched in 2015, it is popular among business professionals and families alike. With a reputation for quality and refinement, the A4 remains a top choice in its class.
Generations and engines
The Audi A4 has evolved through several generations since its debut in 1994. The B6 (2001-2005) and B7 (2005-2008) models featured a range of petrol and diesel engines, with the 2.0 TDI being a popular choice for its balance of power and fuel efficiency. The B8 (2008-2016) introduced advanced technology and a more spacious interior, while the current B9 generation offers a variety of engine options, including 2.0-litre petrol and diesel variants, as well as a 3.0-litre V6 for those seeking more performance. Most models come with either a six-speed manual or a seven-speed dual-clutch automatic transmission.
Honest reliability snapshot
The Audi A4 has a mixed reputation for reliability, with some years performing better than others. Generally, it stands well against its rivals like the BMW 3 Series and Mercedes-Benz C-Class, but potential buyers should be aware of specific model years that have reported more issues.
What to read first
Start by checking our common-problems article to understand the key issues associated with the Audi A4.
Guides for the Audi A4
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Buying guide
A complete used-buyer checklist before you part with cash.
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Common problems
The faults this model is most known for.
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Top fixes
Practical fixes for the issues you will meet.
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MOT failure rates
What fails MOT most often and what each fix costs.
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Recall history
Recall summary: years affected, what was fixed, how to check your own car.
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Reliability
How dependable it actually is, by year.
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Running costs
What UK ownership really costs: fuel, insurance, tax, servicing, depreciation.
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Selling guide
Selling yours? How to show buyers the full history and close the sale faster.
Audi A4 by year
Generation-specific problem guides.
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