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Ford Focus Tail Light Bulbs Replacement Guide
How to change a burnt out brake / parking, rear turn signal & reverse bulb in the tail lights of a 2011-2014 Ford Focus.

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2012 Focus Tail Light
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Open Trunk Lid
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Pull Off Access Panel

This automotive tutorial was specifically written to assist owners of the third generation MK III (2011, 2012, 2013 & 2014) Ford Focus in changing a burnt out brake / parking, rear turn signal or reverse bulb in the tail light housings.

Owners of other similar Ford sedan or hatchback vehicles such as the Fiesta, Fusion, Taurus and C-Max may also find these DIY instructions to be helpful.

Replacement bulbs with their part numbers are as follows: Brake / Parking # 3157 or 3157K, Rear Turn Signal # 3757A or 3757AK and Reverse # 921.

No tools are needed to replace the brake or rear turn signal bulbs.

To access the reverse light bulb, you'll need a standard Phillips head screwdriver.

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Access Panel Removed
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Black Plastic Thumb Screws
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Rotate Counter Clockwise
The first two steps are to pop open the trunk lid and move to the side of the vehicle with the burnt out tail light bulb.

Then locate the plastic access panel at the rear corner of the trunk.

Gently pull off the panel and set it aside in a safe place.

Behind the panel, you'll see two black plastic thumb screws that hold the tail light assembly in place.

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Remove 2nd Thumb Screw
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Thumb Screw Fasteners
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Pull Off Tail Light Housing
Loosen the two thumb screws by turning them counter clockwise and set them aside in a safe place.
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Housing Removed
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Metal Spike & Plastic Hole
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Turn Over Tail Light
The tail light is still held in place by one metal peg or "spike" that is inserted in to a plastic socket on the side of the car.

Gently pull the tail light housing straight off the rear of the vehicle. If you have trouble removing the housing, try wiggling it back and forth while pulling. Do not use excessive force to avoid cracking the plastic lens.

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Brake / Parking Socket
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1/4 Turn Counter Clockwise
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Remove Bulb Socket
To avoid scratching the plastic lens or the painted bumper, place a towel in between them.

Turn the housing over and rest it on the bumper to access the two bulb sockets.

The dual filament brake and parking light bulb is located at the bottom of the tail light housing.

Rotate the brown brake bulb socket 1/4 turn counter clockwise and pull it straight out of the housing.

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Pull Out Old # 3157 Bulb
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Push In New Bulb
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1/4 Turn Clockwise
Pull the old brake light bulb straight out of the socket and push in a new number 3157 or 3157K bulb.

The 3157 bulb is available from various manufacturers including Sylvania, GE, Philips and Wagner.

Re-insert the socket back in to the housing and rotate it 1/4 turn clockwise to secure it in place.

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Turn Signal Bulb Socket
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1/4 Turn Counter Clockwise
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Change Old # 3757A
The black plastic turn signal bulb socket is located at the top of the tail light housing.

Rotate the socket 1/4 turn counter clockwise and pull it straight out.

Pull the old bulb straight out of the socket and push in a new amber colored number 3757A or 3757AK bulb.



 

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1/4 Turn Clockwise - Lock
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Line Up Tail Light Assembly
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Insert Peg In To Socket
Re-insert the socket in to the housing and rotate it 1/4 turn clockwise to lock it in place.

Line up the tail light assembly with the corner of the vehicle.

Insert the metal peg in to the plastic grommet on the side of the vehicle.

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Push Tail Light On To Car
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Spin On Two Thumb Screws
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Turn Clockwise - Tighten
Push the tail light housing back in to place on the corner of the car.

Move to inside the trunk and spin on the two black plastic thumb screws by turning them clockwise. Tighten the fasteners until they are snug.

Avoid over tightening the thumb screws to prevent from cracking the plastic housing.

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Replace Trim Panel
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Test New Light Bulbs
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Reverse In Trunk Lid
Line up the access panel at the rear corner of the trunk and push it back in to place.

The reverse light bulb is located inside a separate housing in the trunk lid.

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Carpeted Trunk Lid Liner
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Loosen Plastic Phillips Screw
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Remove Plastic Screw
Open the trunk lid all the way and locate the black plastic fasteners that hold the carpeted liner in place.

Loosen the plastic screw in the center of the fasteners with a Phillips head screwdriver by turning them counter clockwise.

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Remove Trunk Lid Fastener
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3 Black Plastic Fasteners
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Pull Back Trunk Lid Liner
Pull out the plastic screw from the center of the fastener and then remove the larger outer piece.

You'll need to remove at least three of the trunk lid fasteners located around the rear of the reverse light housing.

Gently pull back the trunk lid liner.

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Loosen Thumb Screw
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Turn Counter Clockwise
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Pull Off Light Housing
Remove the single black plastic thumb screw by turning it counter clockwise. Set the thumb screw aside in a safe place.

Gently pull the reverse light housing straight off the trunk lid.

The housing is also held in place by two metal pegs that act as friction fasteners. If you have trouble removing the housing, try wiggling it back and forth while pulling.

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Turn Over Reverse Housing
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1/4 Turn Counter Clockwise
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Remove Bulb Socket
Turn over the housing to access the reverse bulb socket.

Rotate the socket 1/4 turn counter clockwise and pull it straight out of the housing.

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Pull Out Old Reverse Bulb
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Push In New # 921 Bulb
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1/4 Turn Clockwise
Pull the old bulb straight out of the socket and push in a new number 921 bulb.

Re-insert the socket in to the housing and rotate it 1/4 turn clockwise to lock it in place.

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Push On Reverse Housing
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Tighten Thumb Screw
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Push In Outer Piece
Line up the two metal spikes on the rear of the housing with the holes in the trunk lid. Push the reverse light housing straight on to the trunk lid.

Tighten the thumb screw by turning it clockwise until it is snug.

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Push In Plastic Screw
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3 Fasteners Replaced
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Test New Reverse Bulb
Push in the larger outer pieces of the three trunk lid fasteners first. Then push the black plastic screws in to the center of each fastener to secure them in place.

Test the new tail light bulbs by having someone step on the brake pedal, activate the hazard signals and place the transmission in reverse.

For more, check out my other Ford Focus Repair & Maintenance Guides.
 

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