BMW 3 Series Radio Code: Unlock Your E46 Stereo Online

Q: Which Radio Is in Your E46?

BMW Business CD (Philips): The standard head unit in most E46 models. BMW Professional CD (Alpine or Becker): The upgraded unit with superior sound. BMW Navigation (Becker): The navigation system with built-in radio. All three require a stereo unlock code after a power interruption.

Q: Will the same code work if I fit the radio in another E46?

Yes. The BMW 3 Series radio code belongs to the radio, not the car. You can use the same code in any vehicle.

The BMW 3 Series E46 (1998–2006) is an iconic model still widely seen on UK roads. The original head unit — usually a BMW Business CD or Professional CD — locks after a power interruption. This guide explains how to retrieve your BMW 3 Series radio code.

Which Radio Is in Your E46?

BMW Business CD (Philips): The standard head unit in most E46 models.
BMW Professional CD (Alpine or Becker): The upgraded unit with superior sound.
BMW Navigation (Becker): The navigation system with built-in radio.

All three require a stereo unlock code after a power interruption.

Finding the Serial Number

The serial number is essential for retrieving your BMW 3 Series radio code.

Method 1: Label on the Radio

Remove the radio using BMW DIN release keys (two keys required).
Carefully pull the unit forward out of the dashboard.
Note the serial number on the top or side label (typically starts with BP or BE followed by digits).

Method 2: Via Diagnostic Tool (BMW ISTA)

With a BMW diagnostic tool (ISTA or equivalent) you can read the serial number without removing the radio. This requires specialist equipment.

Retrieving the Radio Code

Go to RadioCodeLookup.com/brands/bmw.
Enter the serial number from your E46 radio.
Receive your BMW 3 Series radio code.

Entering the Code on the BMW E46

Switch the radio on — the display shows CODE.
Use the preset buttons to enter the digits.
Confirm with the right rotary dial (Business CD) or the > button.

Frequently Asked Questions

My BMW E46 shows LOCKED. What now?

LOCKED means too many incorrect codes have been entered. Leave the ignition on for at least two hours. The message will revert to CODE.

Will the same code work if I fit the radio in another E46?

Yes. The BMW 3 Series radio code belongs to the radio, not the car. You can use the same code in any vehicle.

Can I replace the E46 head unit with an aftermarket radio?

Yes, but you will need an ISO adapter and possibly a steering wheel control interface. With an aftermarket unit, no stereo unlock code is required.