Which radio is in your Audi A4?
The A4 has had 3 sets of radios since 1995, from the Audi cassette radios, then Chorus, Concert and Symphony to the MMI systems. Find yours by year below, but go by the serial: radios get swapped, and the free check reads it for you.
How to find your Audi A4 radio serial number
On the label
- Check the radio card in the handbook wallet first.
- Otherwise take the radio out with radio removal keys.
- Copy the serial from the label: 14 letters and numbers starting VWZ, AUZ, SKZ or SEZ.
Photograph the label rather than copying it by hand — 0 and O, 1 and I are easy to mix up.
It comes out with a pair of radio removal keys. Which keys, and where they go: how to remove a car radio.
Tips for your Audi A4
- A B8 (2008 on) that plays but stays silent after a radio swap is a car-matching problem, not a lost code.
- Symphony and Navigation Plus radios are double height and need four keys.
- The radio card in the wallet carries the serial and often the code itself.
How to enter your Audi A4 radio code
VW group (Beta, Gamma, RCD, Concert…)
- Buttons 1 to 4 set each number (press again to count up).
- Hold one of the arrow (seek) buttons for 2 seconds or more to finish.
If your Audi A4 radio says LOCKED, WAIT or SAFE
| Radio | What to do |
|---|---|
| VW group (Beta, Gamma, RCD, Concert…) | SAFE — leave the radio on for 1 hour (the ignition must stay on), then try again. |
What LOCKED, WAIT and SAFE mean, and how long to wait →
Audi A4 radio code questions
Can you unlock a 2010 A4 radio?
No. From the B8 the system is matched to the car, so no serial code exists. An Audi dealer can re-pair it.
Where is the A4 radio serial?
On the label on the radio case, or on the radio card in the service wallet.
My A4 asks for a code after a new battery.
Enter the code with buttons 1 to 4, then hold the right-hand seek button. Get the right code first: wrong tries make the wait longer.
Can you do every Audi A4 radio?
For 1995–2001, 2001–2008, yes: the code appears on screen as soon as you have paid; for 2008 on, not at the moment. The free check tells you which yours is before you pay.
Which radio does my Audi A4 have?
It depends on the year. 1995–2001 (A4 B5): Audi cassette radios, then Chorus, Concert and Symphony. 2001–2008 (A4 B6 and B7): Concert, Symphony and Navigation Plus. 2008 on (A4 B8): MMI systems. Radios were often swapped, so the serial on yours is what counts.
What does the serial look like on an Audi A4?
1995–2001: 14 characters starting AUZ, on the label or the radio card. 2001–2008: 14 characters starting AUZ. For example VWZ1Z2S4292662.
Do I have to take the radio out of my Audi A4?
Yes: the serial is on the label, not the screen. It comes out with a pair of radio removal keys.
How do I enter the code on an Audi A4?
Button 1 sets the first digit, button 2 the second, and so on, pressing repeatedly to increment. Confirm by holding either rocker switch for more than two seconds.
Another Audi?
Every Audi radio we can unlock is on our Audi radio code page. Close to this one: A3, A6, Concert, Symphony.
Updated October 2026