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Hello, just to make sure I understand the situation, you lost both keys and then had a new key made and now the engine won't start is this so? Who made this key for you?
Thanks, ***** ***** Sequoia had an engine immobilizer system which requires a key with a transponder chip so the computer can recognize the key and let the engine start, you either now have a key that is not a "chip" key or the key is a chip key but needs to be programmed to work, sorry but there are two choices, either the Toyopta dealer or a locksmith that is certified todo this procedure, in some cases the theft deterrent control unit has to be replaced or the computer reset.