Hi,
I looked through the wiring schematic for the exterior lights, which I attached below. There is a specific fuse for the left rear taillights.
The first thing we need to check is that. It is located in the under-hood fuse box. If you look at pics 3 and 4, it shows what fuse 33 is responsible for and the location of the fuse in the box.
When you check this fuse, it is important to make sure it is good. Additionally, if the fuse is good, it's really important to check for power to and from it. There is another fuse further up that powers it, but I don't think that is the issue.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
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Monday, January 10th, 2022 AT 8:11 PM