Here's a simple guide to replace the rear tail light bulbs for the Focus RS. You can use this write up for swapping standard halogen bulbs with LED.
Items Needed:
1) Blue Tape
2) Rear Bulbs: Rear Turn Signal Lights (3757), Back Up Lights (921), Tail Lights (3157), Brake Lights (3157)
Step 1 - Protect the paint with blue tape.
Step 2 - Remove access cover.
Step 3 - Remove both wing nuts.
Step 4 - Remove tail light.
Step 5 - Replace desired bulb with new bulb.
Items Needed:
1) Blue Tape
2) Rear Bulbs: Rear Turn Signal Lights (3757), Back Up Lights (921), Tail Lights (3157), Brake Lights (3157)
Step 1 - Protect the paint with blue tape.

Step 2 - Remove access cover.


Step 3 - Remove both wing nuts.



Step 4 - Remove tail light.



Step 5 - Replace desired bulb with new bulb.

