Hyundai Sonata Transponder key and Keyless Entry (844)FOB-KEYS
Hyundai Sonata metal key
If your Hyundai Sonata was menufecture in the years, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, and 2010, then you have just a old fashioned metal blade key, This ignition key has no electronic features or security.
Duplicating a regular Hyundai Sonata key is quite a simple process. All you have to do is take your key to the dealership, a hardware store like Home Depot, Home Depot, cut keys online or maybe even call a mobile locksmith to come out to your house and cut a duplicate key on the spot for your full convenience.
If you lost all the keys to your Hyundai Sonata, you can go to the dealership or a local locksmith store with the VIN of your vehicle and a proof of ownership (title/insurance/registration) and get a brand new key cut.
Hyundai Sonata laser cut key
If your Hyundai Sonata was built in the years 2011, 2012, 2013, 2014, 2015, 2016 or 2017, and you turn a key in the ignition to start the engine, you have a Sidewinder key with a SMARTRA transponder chip.
Hyundai Sonata 2011 and up there is no on-board interface to duplicate a transponder key key! If you want to make a spare key, you have to drive the vehicle to a locksmith store or to the dealer or if you are looking for the comfort, call a mobile locksmith to come out to your location.
When loosing your keys completely, you will have to tow the vehicle to the dealer or call a mobile locksmith to come out to your location to reprogram the vehicle computer to accept a new key and reject the old one.
Hyundai Sonata Smart Key
Since 2011 Hyundai Sonata might use a Proximity Key keyless entry device with a push to start ignition. This keyless entry device has automatic locking and unlocking features that allows you to easily get in and out of your vehicle. By having the key in your purse or pocket within a short range of the car, you can unlock your vehicle and lock the vehicle by pressing the button again, and pushing the button on the dashboard will start the car.
Duplicating and misplacing the smart key have same limitation like the transponder keys above.
FYI: Used smart keys cannot be programmed to different car.