Yo bros,
My 02 320 comes with 4 as described by Radon39.
Referring to the pic I attached, from Left->Right:
Key (1)&(2) - we're all familiar, Master keys, self-charging and programable to remember key holder's mirror, aircon and seat position. The Master Keys locks and unlock doors, boot & glove compartment. Note that the boot and glove compartment and be furher locked by using these keys by turning 90 degrees.
Key (3) - My jogging key
It is NOT the valet key, but the wallet key. Don't underestimate this little guy. It does everything the master keys do. I keep this in my key pouch that holds all my house key as a back up.
Key (4) - Valet key. Can start engine and unlock car door. CANNOT open boot (if it is manually lock using a key) and CANNOT open glove compartment. So put your valuables in the Boot or glove compartment and lock them using either the master key or wallet key. The valet holding Key(4) have no access to them, hence THE valet key.
Once the car is locked using central locking from the key, the central locking in the car will not work, sort of creating a "Panic room". The idea is if someone break-in to your car, he still can't open the doors and attempt to drive it off.
In the unfortunate case in ST, the gentleman made the mistake of (1) locking his car doors then (2) put his key in the boot then (3) close his boot (4) not having a wallet key. Kind of a unique situation that rarely occurs. What was he :thinking: anyway.
I'm not sure if all car models come with similar key counts, but for bros who has not receive the wallet key from the previous owner, might want to double check as it IS a important key to have.
For bros who are concern about a similar situation, I recall that it is a factory option that can be disabled. Do it at your next service if you want to ....