Mercedes-Benz E-class 1998 Starting and Turning Off the Engine - Manual (Page 15)

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Electronic reserve key without
remote control functions, plus
removable mechanical key.
The electronic reserve key (1) works
only in the steering lock.
The mechanical key (2) works only in
the driver's door, trunk, and storage
compartment locks.
To use the mechanical key (2), remove
it from its electronic reserve key (1).
Note:
We recommend that you carry the
electronic reserve key with mechanical
key with you and keep it in a safe place
(e.g. your wallet) so that it is always
handy. Never leave the electronic
reserve key in the vehicle.
Remove the mechanical key from the
electronic main key when using valet
parking service. To prevent access to
trunk or storage compartments lock
them separately.
Obtaining Replacement Keys
Your vehicle is equipped with a theft
deterrent locking system requiring a
special key manufacturing process. For
security reasons, replacement keys can
only be obtained from your authorized
Mercedes-Benz dealer.
Start Lock-Out
Important!
Removing the electronic key from the
steering lock activates the start lock-
out. The engine cannot be started.
Inserting the electronic key in the
steering lock deactivates the start
lock-out.
Note:
In case the engine cannot be started,
the system is not operational. Contact
an authorized Mercedes-Benz dealer or
call 1-800-FOR-MERCedes.