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the accelerator/brake pedal routine usually do work to program a new transponder (immobilizer) key to particular cars (worked in my 2002 sienna). much like opening/closing doors to program the key fob remote. a little search will provide you with the instructions to program either key fob or transponder key to your particular car.
for the transponder key programming (programmed key will also act as a master key), you will need the master key (with black rubber head). valet key will not work! if you lose all your master keys, tough luck, your ECU needs to be reflashed by the dealer to clear the old master key codes and match a new master key. not sure, but I think, you will lose the valet key programming after the reflash as it has the same code as the old master key.
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