Free Audi A4 Radio Code: Every Free Route Explained

Q: Which Audi A4 radios need a code?

This applies to the A4 B5 (1994-2001), A4 B6 (2000-2004) and A4 B7 (2004-2008). These generations were fitted with an Audi Concert or Symphony radio, which carries an AUZ serial number. That serial number is the key to everything: the code is tied to it, not to your number plate. One important note: the A4 B8 (2007 onwards) with MMI 3G has no separate radio code at all. If your car has an MMI system, you are not locked out — you are looking at a different fault, and no code will help.

Your Audi A4 has been to the garage, the battery was disconnected, and now the display simply reads SAFE or asks for a code. Before you spend anything, it is worth knowing that there really are free routes to a radio code — and this article walks through all of them, step by step. Only after you have seen exactly how much work each one takes does the honest conclusion follow.

Which Audi A4 radios need a code?

This applies to the A4 B5 (1994-2001), A4 B6 (2000-2004) and A4 B7 (2004-2008). These generations were fitted with an Audi Concert or Symphony radio, which carries an AUZ serial number. That serial number is the key to everything: the code is tied to it, not to your number plate.

One important note: the A4 B8 (2007 onwards) with MMI 3G has no separate radio code at all. If your car has an MMI system, you are not locked out — you are looking at a different fault, and no code will help.

Free route 1: read the serial number from the radio itself

The Concert and Symphony units can show their serial number on the display without any tools.

Switch the ignition on and turn the radio on so the SAFE prompt appears.
Press P.SCAN and RDS simultaneously and hold them.
Wait for the display to change — on many units the AUZ serial number appears for a few seconds.
Write it down exactly, including all letters and digits.

This costs you nothing but a minute. The catch: not every Concert or Symphony variant responds to the combination, and some show only part of the information. If nothing appears, you move on to the next step.

Free route 2: remove the radio and read the label

If the display refuses to cooperate, the serial number is printed on a sticker on the radio housing.

You need the correct DIN removal keys for Audi units — four flat keys that slide into the slots on the front panel.
Disconnect the battery or at least switch everything off before pulling the unit.
Slide the keys in until they click, then pull the radio straight out without twisting.
Unplug the antenna and the main connector, then read the AUZ number from the label on the top or side of the case.
Refit carefully — bent keys, scratched trim and torn connectors are the usual souvenirs of a rushed job.

Free in cash terms, but budget realistically: buying or borrowing keys, working in a cramped dashboard, and reassembling everything without damage easily costs an hour.

Free route 3: find the original code card

Every A4 left the factory with a code card. Look in:

the service booklet or the wallet it came in;
the owner's manual pouch in the glovebox;
the folder of paperwork the previous owner handed over.

On a car that is fifteen to thirty years old and has changed hands several times, this card is very often long gone. Worth five minutes of searching, no more.

Can a dealer give me the code for free?

Sometimes, yes. An Audi dealer can look the code up against the serial number, but expect the following:

Bring the vehicle registration document and proof that you own the car — no dealer hands out codes to a stranger.
You will usually need an appointment, and the service desk works to its own schedule.
You may still be asked to bring in the serial number yourself, which sends you back to route 1 or 2.
Many dealers charge an administration or labour fee anyway, so "free" is not guaranteed.

Add up the driving, the waiting and the paperwork and this is the slowest option on the list.

Are free online calculators and forums safe?

This is where free becomes genuinely expensive. Free generators and forum threads promise an instant Audi code from your AUZ number, but they work from incomplete databases and guesswork. The real danger is the attempt counter: every wrong code you type in counts. After a limited number of failed attempts the radio blocks, first with a waiting time and eventually permanently. At that point no code will unlock it and the unit has to go to a specialist or be replaced. A free guess can turn a working radio into a paperweight.

So what is actually the fastest and safest route?

Add it up honestly: hunting for a card that probably no longer exists, a button combination that may not respond, pulling the radio out of the dashboard with removal keys, a dealer visit with documents and an appointment, or a calculator that risks locking the unit for good.

Ordering the code removes all of that. You supply the AUZ serial number, the correct code is looked up and delivered by e-mail within minutes, and it comes with a money-back guarantee — so there is no gamble and no lockout risk. The whole process is simple: find the serial number with P.SCAN+RDS or by removing the radio, enter it when placing your order, then enter the code you receive.

Order your Audi A4 radio code and have your Concert or Symphony playing again today.