Driver 3 Codes -

All weapons:
Press (x2), , (x2), (x2) at the main menu. A sound and the option will be unlocked at the menu to confirm correct code entry.

Unlimited ammunition:
Press (x2), (x2), , (x2) at the main menu. A sound and the option will be unlocked at the menu to confirm correct code entry.

Invincibility:
Press , , , , , (x2) at the main menu. A sound and the option will be unlocked at the menu to confirm correct code entry. This has no effect in undercover mode.

Immunity:
Press , , (x2), (x2), at the main menu. A sound and the option will be unlocked at the menu to confirm correct code entry. This has no effect in undercover mode. No police will chase you in this mode.

All missions:
Press (x2), (x2), (x2), at the main menu. A sound and the option will be unlocked at the menu to confirm correct code entry.

All vehicles:
Press (x2), (x2), , , at the main menu. A sound and the option will be unlocked at the menu to confirm correct code entry.

All cities unlocked in Take A Ride:
First, enable the "All missions" code. Then, press , , , , , , . There is no confirmation sound. After this, go into Take A Ride mode and Istanbul should be available.

Horn:
Press R1 or L3 for the horn.

Burnout:
Press Circle or R3 to burnout.