This is the most common problem Tesla mobile service technicians deal with currently.
Even if you qualify for a replacement light assembly under warranty, think about what happens to the original part. It's thrown in a bin and sent to be recycled. What a waste! These light units can be repaired cheaply and easily and we show you how.

Timestamps:
0:00 Intro - Poor swan!
0:22 The problem
0:45 Why does it happen?
1:09 Construction of a LED lamp unit
1:40 Removing a Model 3 taillight
3:17 What isn't causing fogging
3:35 Part number revisions
4:06 The Gore automotive vent patch
4:50 B-pillar cameras also suffer from condensation
5:30 How the taillight is sealed
6:22 Let's try the 'water test'!
6:49 Bubbles!
7:45 Drying the light unit out completely
9:05 Sealing the light unit properly
10:34 Reinstalling the taillight
12:00 Why should I fix my own foggy lights?
12:20 Outro

Here's a great video explaining how Gore vents work in this application:    • Part3:  Condensation  

Important note! At 11:10 I show the foam gasket being replaced AFTER I re-installed the unit. I should have put it back on BEFORE I put the unit back onto the lid, as its purpose is to seal the area around the connector to the boot lid and prevent water ingress there. Thanks to Kev L for pointing this out. He wins a free Tesla Gurus T-Shirt from our store for spotting our deliberate mistake! https://shop.spreadshirt.co.uk/teslag...

A couple of sealants suggested for this job:
Plastidip Liquid Electrical Tape: https://www.plastidip.co.uk/
Captain Tolley's Sealant: http://www.captaintolley.com/

A useful kit including plastic fasteners and trim removal tools: https://amzn.to/39H2b7f

Many more tips, tricks and information to come on Tesla Gurus. Please comment below and tell us what you'd like to see!

And remember - don't use a microwave oven...

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