If the Smart Key does not operate normally, you can lock or unlock the door by using the mechanical key.

Press and hold the release button (1) and remove the mechanical key (2). Insert the mechanical key in to the key hole on the door.
To reinstall the mechanical key, put the key into the hole and push it until a click sound is heard.
Start-up
Loss of a smart keyHyundai Tucson (LM) 2010-2015 Owners Manual: Climate control air filter
The climate control air filter installed behind the glove box filters the dust
or other pollutants that come into the vehicle from the outside through the heating
and air conditioning system.
If dust or other pollutants accumulate in the filter over a period of time, the
air flow from the a ...
Hyundai Tucson (LM) 2010-2015 Service Manual: Fuel Pressure Control Valve Repair procedures
Inspection
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Disconnect the fuel pressure regulator valve connector.
3.
Measure resistance between the fuel pressure regulator valve terminals 1 and 2.
4.
Check that the resistance is within the specifica ...