Hey
I've done a search but nothing turned out,

4 Days ago both taillights wouldn't light up when I turn the lights on (brake-lights work though)
Now, for some reason the right one works fine, but my left taillight (both bulbs) doesn't light up when I turn the lights on.

The brake lights work fine so I am guessing it has to be the wiring. (Checked bulbs also).
Does anyone have any ideas?
These are oem lights.

 

Sounds like wiring

 

Easy enough to check - with automotive voltmeter, see if there is any juice going to the bulb sockets, if not - trace it to where the current stops.