The price to get a second is going to be somewhere in the neighborhood of $187 from Lexus! No joke. Do get a second key. If you lose the one you have, it costs even more to have a new Engine Control Module installed and new keys made.
There is an alternative. Using your VIN, many locksmiths can get the key code and laser cut you a master key. Then you can program it yourself using the following instructions:
To duplicate a key:
- Simultaneously depress and release brake and accelerator pedals 1 time.
- Insert existing master key into ignition. (DO NOT TURN)
- Within 15 seconds depress and release accelerator pedal 5 times, (not too rapidly).
- Within 20 seconds depress and release the brake pedal 6 times and remove key.
- Within 10 seconds insert new key into ignition.
- Within 10 seconds depress and release the accelerator pedal 1 time. At this time the security light starts blinking.
- After 45 to 60 seconds new key is registered and security light goes off (stops blinking).
- Remove new key and try starting the car.
When Lexus dealers or locksmiths mention "programming" a key, they make it sound like a PHD in engineering is needed to complete the arduous task. Wrong, anybody can quickly do it if they have the information.