🔧 4Runner - Headlight Bulb Replacement

On your 4Runner, the headlight bulbs are accessed from behind the headlight housing in the engine bay. The job is mostly “twist-and-remove,” but it’s important not to touch the new bulb’s glass so it lasts.

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

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⚠️ Safety & Precautions

• ⚠️ Turn headlights OFF and let bulbs cool 10 minutes (they get extremely hot).
• ⚠️ Do not touch the new bulb glass with bare fingers (skin oil can shorten bulb life).
• ⚠️ Keep keys out of the vehicle so lights can’t be turned on accidentally.
• 🔋 Battery disconnect is not required, but avoid letting tools touch the battery terminals.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Flashlight
• Plastic trim tool
• 10mm socket
• 1/4" ratchet

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Low beam headlight bulb (H11) - Replace in pairs - Qty: 2
• High beam headlight bulb (9005) - Replace in pairs - Qty: 2

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📋 Before You Begin

• 🅿️ Park on level ground, shift to Park, and set the parking brake.
• 💡 Switch the headlight stalk to OFF and wait for bulbs to cool.
• 🧤 Put on nitrile gloves (they keep oil off the bulb).
• 🔎 Quick check: Are you replacing low beams, high beams, or both? The steps are nearly the same, but the bulb type differs.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open access and identify the correct bulb

• Open the hood and use a flashlight to look behind the headlight assembly.
• Identify the socket you’re replacing:
  • Low beam: typically the larger main headlight bulb (H11).
  • High beam: typically the inner reflector bulb (9005).

Step 2: Make room if your hands don’t fit (only if needed)

• If access is tight, use a plastic trim tool to gently release any nearby plastic clips that block your hand path.
• If a small bracket or cover is held by bolts, remove them using a 10mm socket and 1/4" ratchet.
• Take a photo before moving anything.

Step 3: Disconnect the bulb electrical connector

• Grip the connector (not the wires).
• Press the locking tab and pull the connector straight off.
• If it’s stubborn, use a plastic trim tool to gently help the tab release.

Step 4: Remove the old bulb

• Rotate the bulb/socket counterclockwise about 1/4 turn by hand, then pull it straight out.
• Use a flashlight to confirm the bulb’s locking tabs and orientation.

Step 5: Install the new bulb (no touching the glass)

• With nitrile gloves on, insert the new bulb into the housing in the same orientation as the old one.
• Rotate clockwise until it stops and feels fully seated.
• If you accidentally touch the glass, wipe it with isopropyl alcohol and let it dry fully. Clean glass helps bulb life.

Step 6: Reconnect and reassemble

• Push the electrical connector back on until it clicks.
• Reinstall any brackets/covers you moved using the 10mm socket and 1/4" ratchet.
• Make sure nothing is resting on the bulb wiring.

Step 7: Repeat on the other side

• Replace the matching bulb on the other headlight (bulbs should be replaced in pairs for even brightness/color).

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✅ After Repair

• 💡 Turn the headlights ON and confirm both sides work on the setting you replaced (low and/or high beam).
• 🔦 Check the beam pattern against a wall at night—both sides should look even.
• 🧰 If a bulb doesn’t light, turn lights OFF and re-check the connector is fully clicked in and the bulb is fully locked.

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💰 DIY vs Shop Cost

Shop Cost: $120-$250 (parts + labor)

DIY Cost: $30-$120 (parts only, depending on bulb type/brand)

You Save: $90-$130 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.