An Audi radio code is a four-digit number tied to the head unit serial, printed on the casing label as AUZ followed by seven characters. Enter that serial on this page and the code is retrieved for £19.99, refunded in full if no working code can be supplied.
Radio codes belong to the head unit serial number, not the vehicle registration or VIN.
A flat battery, battery replacement or radio removal is what triggers the code prompt.
Audi serial formats: Concert / Chorus (e.g. AUZ2Z3A1234567); Symphony (e.g. AUZ4Z7B1234567); RNS-E navigation (e.g. AUZ5Z1L1234567).
Display messages: SAFE = Anti-theft lock active — code required. · 1000 = Starting display for code entry. · SAFE + number = Lockout countdown after failed attempts. · Component protection = A vehicle-level lock on retrofitted units — needs coding to the car, not a radio code.
Bob's never displays a guessed or generated code — if a working code can't be retrieved you get a full refund.
Where to find the serial number, what the display messages mean and how to key the code back in on a Audi.
An Audi radio code is a four-digit security code held against the head unit serial. It is not the immobiliser and not the key — it exists only to stop a stolen unit working in another car.
When you'll be asked for the code:
After a flat battery or a battery replacement
When the radio has been removed for dash or amplifier work
After fitting a used Concert or Symphony unit
Following a deep discharge on a car stored over winter
Serial number formats:
Concert / Chorus — for example AUZ2Z3A1234567. A3 8P, A4 B6/B7, A6 C6 — label on the casing.
Symphony — for example AUZ4Z7B1234567. Higher-spec cassette/CD changer units.
RNS-E navigation — for example AUZ5Z1L1234567. Serial shown on the label and in the service menu.
How to find the serial number:
Look for the code card supplied with the car — usually in the service book wallet.
Remove the unit with a pair of U-shaped Audi radio keys pushed into the slots each side until they click.
Read the label on the top of the casing: note the AUZ serial and the part number beginning 8E0, 8P0 or similar.
On RNS-E units the serial can also be read through the service menu, but the label is easier to trust.
Take a photograph rather than transcribing — a single wrong character means a wrong code.
What the display messages mean:
SAFE — Anti-theft lock active — code required.
1000 — Starting display for code entry.
SAFE + number — Lockout countdown after failed attempts.
Component protection — A vehicle-level lock on retrofitted units — needs coding to the car, not a radio code.
How to key the code in:
Press and hold preset 1 to enter code mode on most Concert units.
Presets 1 to 4 step each digit up in turn.
Hold preset 5 or the SCAN button to submit.
SAFE clears and the radio resumes.
Concert, Symphony, Chorus and SAFE mode
The coded units are the Concert, Symphony and Chorus radios and the older RNS-E navigation head, fitted to the A3 8P, A4 B6 and B7, A6 C6 and TT. After the battery has been disconnected the display reads SAFE, often with a number next to it.
That number is the count of attempts remaining, not a clue. MMI systems on later cars use component protection instead: the unit pairs to the car electronically, so it will not lock after a flat battery but it also will not work if moved to a different Audi.
Getting the unit out
Concert and Symphony units release on four flat keys pushed into the corner slots until they click, then drawn straight out with light outward pressure. The RNS-E is the same principle but heavier, so support it as it comes free.
Work with the ignition off and keep the keys square. Audi catches are narrow and a twisted key is what turns a ten-minute job into a workshop visit.
On the label, the line you need starts AUZ. Photograph it — the character after AUZ is commonly a Z or a digit and getting that wrong is the usual cause of a rejected code.
Cost and what to avoid
£19.99 here against the serial, refunded in full if no working code can be supplied. An Audi dealer typically charges £30 to £45 for the lookup and adds workshop time if they remove the unit.
Do not trust an online generator for an AUZ serial. Audi codes are retrieved, not calculated, and once SAFE counts down to zero the unit locks for an hour — which has to run with the ignition on, so it is an hour of sitting in the car rather than an hour of the car being parked.
Is the Audi radio code the same as VW's? The system is the same VAG design, but the serial prefix differs — AUZ on Audi, VWZ on Volkswagen — and every code is unique to its own unit.
My retrofitted unit says component protection That is not a radio code problem. Component protection ties the head unit to the specific car and has to be cleared with diagnostic coding.
Can I read the serial without removing the radio? Occasionally a hidden menu shows it on RNS-E units, but on Concert and Symphony units the casing label is the practical answer.
How many attempts before lockout? Three is typical, then a timed wait that grows with each further failed round. Verify the serial first.
How much is an Audi radio code? £19.99 on this page against the head unit serial, with a full refund if no working code can be supplied.
What does SAFE mean on an Audi radio? The unit is locked and waiting for its code. The number shown with it is the remaining attempts before a timed lockout.
Where is the AUZ serial on an Audi radio? On the label on the top of the head unit casing, shown as AUZ followed by seven characters. The unit has to come out of the dash to read it.