Identifying fault codes Audi A4 2001 - 2004 | Haynes Manuals

Identifying fault codes Audi A4 2001 - 2004 | Haynes Manuals

Regular checks /

October 2025

1 minute read

Time

10 minutes

Difficulty

Find your vehicle

- step 1

If a fault occurs, some of the systems will generate and store a fault code

- step 2

Open the ashtray and unclip the cover from the 16-pin diagnostic socket. 2001-on models only

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