The remote key will not work if any of the following occur:
When the remote key does not work correctly, open and close the door with the mechanical key. If you have a problem with the remote key, it is recommended that you contact an authorized HYUNDAI dealer.
If the remote key is in close proximity to your mobile phone, the signal could be blocked by your mobile phones normal operational signals. This is especially important when the phone is active such as making and receiving calls, text messaging, and/or sending/receiving emails. Avoid placing the remote key and your mobile phone in the same pants or jacket pocket and always try to maintain an adequate distance between the two devices.
NOTICE
Keep the remote key away from electromagnetic materials that blocks electromagnetic waves to the key surface.
If the remote key is not working properly, try replacing the battery with a new one.

Battery Type: CR2032
To replace the battery:
1. Insert a slim tool into the slot and gently pry open the cover.
2. Remove the old battery and insert the new battery. Make sure the battery position is correct.
3. Reinstall the rear cover of the remote key.
If you suspect your remote key might have sustained some damage, or you feel your remote key is not working correctly, it is recommended that you contact an authorized HYUNDAI dealer.
Remote key
Smart keyHyundai Creta GS 2014-2019 Service Manual: Catalytic Converter: Description and operation
Description
The catalytic converter of the gasoline engine is a three way catalyst. It oxidizes
carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides
of nitrogen (NOx).
...
Hyundai Creta GS 2014-2019 Service Manual: Repair procedures
Inspection
Check it by the procedure below to see if the function of the ECM is normal.
1.
Turn the ignition key to the "ON" position.
2.
Cover the forward facing sensor.
3.
Head a light to the re ...