If the Smart Key is not working properly, try replacing the battery with a new one.
Battery Type: CR2032
To replace the battery:
1. Pry open the rear cover of the smart key.
2. Remove the old battery and insert the new battery.
3. Reinstall the rear cover of the smart key.
If you suspect your smart key might have sustained some damage, or you feel your smart key is not working correctly, contact an authorized HYUNDAI dealer.
Information
An inappropriately disposed battery can be harmful to the environment and human health. Dispose the battery according to your local law(s) and regulation(s).
Hyundai Sonata LF 2014-2019 Service Manual: Crash Pad Garnish Assembly [RH] Repair procedures
Replacement
•
When prying with a flat-tip screwdriver or use a prying trim
tool, wrap it with protective tape, and apply protective tape around the
related parts, to prevent damage.
•
Use a plastic panel removal tool to remove interior trim pieces to protect ...
Hyundai Sonata LF 2014-2019 Owners Manual: Gauges
Speedometer
The speedometer indicates the speed of the vehicle and is calibrated in miles
per hour (mph) and/or kilometers per hour (km/h).
Tachometer
The tachometer indicates the approximate number of engine revolutions per minute
(rpm).
Use the tachometer to select the correct shift points and ...