2003 Toyota MR2 Spyder Owners Manual - Page 206

03 07.07 If you lose your keys You can purchase a new key at your Toyota dealer if you can give them the key number and master key. Even if you lose only one key, contact your Toyota dealer to make a new key. If you lose all your master keys, you cannot make new keys; the whole engine immobilizer system must be replaced. See the suggestion given in "Keys" on page 8 in Section 1- 2. If your keys are locked in the vehicle and you cannot get a duplicate, many Toyota dealers can still open the door for you, using their special tools. If you must break a window to get in, we suggest breaking the side window because it is the least expensive to replace. Be extremely cautious to avoid cuts from the glass. 228 2003 MR2 from Aug. '03 Prod. (OM17511U)