TOYOTA 2010 Yaris - Manual (Page 350)

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5-2. Steps to take in an emergency
If you lose your keys
■ If you lose all your master keys. (vehicles with engine immobilizer sys-
tem)
You cannot make new keys, the whole engine immobilizer system must be
replaced.
New genuine Toyota keys can be made by your Toyota dealer using
the key number stamped on your key number plate. Vehicles with
engine immobilizer system, the dealer will also need the master key.
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→P. 27)