Drivers side rear led lights

[StuDoot80]

Hello everyone I'm new to this and also just got my 1st ever audi s3 8pa sportback 2011, I'm having trouble with my drivers side rear led lights they sometimes come on but most of the time they are off causing a error on my dash, checked the wires no visible damage also cluster is clean I bought the car and the same side wasn't working so got a second hand inner and outer lights and been fine for a few months and now having the same problem in the same side, I have fully working brake light and reverse light and fog light but led part not working any help please its doing my head in now thanks

[cliffcoggin]

Check the earthing of the lamp unit.