🔧 Forester - Rear Turn Signal Bulb Replacement

On your Forester, the rear turn signal is typically an incandescent bulb inside the outer tail lamp. You’ll access it from inside the cargo area, twist the bulb socket out, and swap the bulb.

Difficulty Level: Beginner | Estimated Time: 0.3-0.7 hours

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⚠️ Safety & Precautions

• ⚠️ Turn lights OFF and remove the key before starting.
• ⚠️ Let the lamp cool if it was just used (bulbs get hot).
• ⚠️ Don’t touch the new bulb glass with bare fingers (oil can shorten bulb life).
• ⚠️ Support the tailgate fully open so it can’t drop.
• Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Plastic trim removal tool
• Phillips screwdriver
• 10mm socket
• 1/4" ratchet
• Torque wrench (inch-pound or low-range) (specialty)
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (7440 / W21W) - Qty: 1
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Turn the light switch to OFF and remove the key.
• Open the tailgate and clear cargo out of the rear corner you’re working on.
• Tip: Replace bulbs in pairs for even brightness.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm the correct side and bulb

• Turn on the hazard lights briefly to confirm which rear turn signal is out, then switch them OFF.
• Use a flashlight to look into the lens: if you see a normal bulb shape, this guide applies. If it looks like an LED strip/module, tell me and I’ll give the tail lamp assembly replacement steps.

Step 2: Open the access panel inside the cargo area

• On the same side as the failed bulb, open the small access door/cover behind the tail lamp area.
• If it’s tight, use a plastic trim removal tool to gently pry the edge. (A trim tool is a plastic pry tool that helps remove panels without scratching.)

Step 3: Remove the rear turn signal bulb socket

• Reach through the opening and locate the bulb socket for the turn signal (usually the lower socket on the outer lamp).
• Grip the socket and rotate it counterclockwise about 1/4 turn, then pull it straight out.

Step 4: Replace the bulb

• Wear nitrile gloves.
• Pull the old bulb straight out of the socket (it’s a wedge-base bulb).
• Push the new 7440 / W21W bulb straight into the socket until fully seated.
• Apply a very light film of dielectric grease to the socket seal if it looks dry.

Step 5: Reinstall the socket and test

• Insert the socket back into the lamp and rotate clockwise to lock.
• Turn the hazards ON to test the turn signal, then switch them OFF.
• If it “hyper-flashes” (rapid blinking), re-check bulb seating and that you installed a standard 7440 (not a different type).

Step 6: Refit the access cover

• Reinstall the cargo access cover until it fully snaps/locks back in place.

If you can’t reach the socket: Remove the tail lamp (alternate path)

• Remove any cargo trim fasteners blocking the lamp nuts using a plastic trim removal tool and Phillips screwdriver.
• Use a 10mm socket with a 1/4" ratchet to remove the tail lamp retaining nuts.
• Pull the tail lamp straight rearward to release the locating pins/clips, then remove the socket as in Steps 3–5.
• Reinstall the nuts: Torque to 7.5 Nm (5.5 ft-lbs).

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✅ After Repair

• Verify left and right rear turn signals blink at normal speed.
• Confirm brake lights and tail lights still work (sometimes sockets can get bumped).
• Check that the access cover is secure and nothing rattles.

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💰 DIY vs Shop Cost

Shop Cost: $80-$160 (parts + labor)

DIY Cost: $5-$20 (parts only)

You Save: $60-$150 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.3-0.7 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.