Loose bulb or loose connection.
If you are referring to the brake light then the brake light switch is stuck.
Courtesy lamps are the interior lamps that come on when the door is opened or the interior lamps switch is actuated on the headlight switch. These are different from "interior illumination" lamps that light up your instrument cluster when the headlights come on.
There are many details about the LED lamps of Hyundai i20 in India. The lamps have great interior and exterior performance. They illuminate blue interior light and are designed with a sporty look.
Oil lamps were typically used to light the interior of ships.
Changing the lamps is pretty straight forward. There is a cover over the lamp assembly, remove it. Then, turn the tail lamp (with the connector) counter clockwise about 1/4 turn. Pull the assembly forward, then replace the lamp. Installation is the reverse of removal. Hope this helps.
check for a blown fuse.
you can find springs online or pull the interior light fuse
interior lamps
if it isn't a fuse or lamp problem, check the brake lamp switch on the brake pedal, if you unplug the switch, and jumper the connection, and you have brake lamps, replace the switch...
owners manual fuse box interior lamps pull it then figure it out no sense in a dead battery
All lights flicker its just that they do it so fast you don't see it, but when you can tell a light is flickering it is underpowered, try changing the plug if its not the original one to a higher amped.
Bumper mounted park lamps