🔧 Focus - Tail Light Bulb Replacement

You’ll remove each outer tail lamp housing from inside the trunk, swap the bulb in the bulb socket, then reinstall the lamp. This is a simple job, but you need to be gentle with the lamp alignment pins and trunk trim clips.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

Assumption: “taillight bulbs” = the left & right outer brake/parking (tail) bulbs.

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⚠️ Safety & Precautions

• 🧤 Let bulbs cool before touching; they can be hot.
• 👓 Wear safety glasses when working under the trunk lid and around trim clips.
• 🧼 Don’t touch the new bulb glass with bare fingers; skin oils can shorten bulb life.
• 🔌 Battery disconnect is not required for this bulb swap.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4" drive ratchet
• 6" socket extension
• Trim clip remover (specialty)
• Flat trim tool
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Tail/brake bulb (3157 type) - Qty: 2

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📋 Before You Begin

• 🅿️ Park on level ground, set the parking brake, and turn the lights off.
• 📦 Empty the trunk so you can access the trunk side liners behind each tail lamp.
• 🔦 Have your flashlight ready so you can see the bulb socket tabs clearly.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the left tail lamp nuts (inside the trunk)

• Open the trunk and aim a flashlight at the left trunk side liner behind the tail lamp area.
• Use a trim clip remover (specialty) or flat trim tool to pop out the plastic push-clips holding the liner (pry the center pin out first, then remove the clip).
• Fold the trunk liner back to reveal the tail lamp mounting studs and nuts.

Step 2: Remove the left tail lamp assembly

• Use an 8mm socket, 6" socket extension, and 1/4" drive ratchet to remove the tail lamp nuts.
• From outside the car, hold the lamp and gently pull it straight rearward to release the alignment pins.
• Pull straight back; don’t twist the lamp.

Step 3: Replace the bulb in the left tail lamp

• Locate the bulb socket on the back of the lamp (the round plastic twist-in holder).
• Turn the socket counterclockwise by hand and pull it out.
• Wear nitrile gloves, pull the old bulb straight out, then push the new Tail/brake bulb (3157 type) straight in until fully seated.
• Reinstall the socket and turn clockwise until it locks.

Step 4: Reinstall the left tail lamp

• Align the lamp’s locating pins with the body holes, then press the lamp in until it sits flush.
• Install the nuts using the 8mm socket, 6" socket extension, and 1/4" drive ratchet.
• Torque to 3 Nm (27 in-lb) (snug only; over-tightening can crack the lamp housing).

Step 5: Repeat on the right side

• Repeat Steps 1–4 for the right tail lamp using the same trim clip remover (specialty), 8mm socket, ratchet, and extension.

Step 6: Reinstall trunk liners and clips

• Reposition each trunk liner.
• Reinstall push-clips by inserting the clip body first, then pressing the center pin in using the flat trim tool (or finger pressure).

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✅ After Repair

• 💡 Turn on the parking lights to confirm both tail lights glow evenly.
• 🛑 Press the brake pedal (or have a helper press it) to confirm both brake lights work.
• 🔍 Check that both tail lamps sit flush with the body and there are no gaps.

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💰 DIY vs Shop Cost

Shop Cost: $80-$180 (parts + labor)

DIY Cost: $10-$30 (parts only)

You Save: $70-$150 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.