🔧 Impreza - Headlight Bulb Replacement (Both Sides)

Replacing your A4’s headlight bulbs means accessing the back of each headlamp housing, removing the old bulb, and installing a new one without touching the glass. Your Impreza may have either halogen low beams or HID (xenon) low beams depending on headlamp option, so I’m including both paths below.

Assumption: Stock headlamps; follow the matching bulb type you find on your car.

Difficulty Level: Intermediate | Estimated Time: 0.7-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ If you have HID (xenon) low beams, the system can generate very high voltage—turn lights OFF and disconnect the battery negative cable before touching the bulb/igniter.
• ⚠️ Do not touch the glass part of any bulb with bare fingers; skin oil can shorten bulb life. If you do touch it, clean with isopropyl alcohol.
• ⚠️ Let the headlamps cool before working; housings and bulbs get hot.
• ⚠️ Support the car safely if you access through the wheel well (use jack stands, not just a jack).

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• 10mm socket
• 1/4" ratchet
• 3" extension for 1/4" ratchet
• Phillips #2 screwdriver
• Trim clip remover (specialty)
• Floor jack (rated 2-ton minimum)
• Jack stands (pair, rated 2-ton minimum)
• Wheel chocks
• 21mm socket
• Torque wrench (10-150 Nm range)
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Halogen low beam bulb (H11) - Qty: 2
• Halogen high beam bulb (9005) - Qty: 2
• OR HID (xenon) low beam bulb (D2S) - Qty: 2
• Isopropyl alcohol wipes - Qty: 1
• Replacement plastic push clips (fender liner) - Qty: 4

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Chock the rear wheels using wheel chocks.
• Turn the lighting switch OFF and remove the key.
• If you have HID low beams: open the hood and disconnect the negative battery terminal using a 10mm socket. Wait 5 minutes before touching HID parts.
• Plan your access: you can usually reach bulbs from the engine bay, but the wheel-well access is often easier for hands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Identify your bulb type (quick check)

• Open the hood and look at the back of the headlamp.
• If you see a large round cap and “H11/9005 style” plug-in connector, you likely have halogen.
• If you see an igniter/ballast-style connector and a metal-retained bulb base (often labeled D2S), you have HID low beams.
• Use a flashlight to read markings on the bulb base/cap area.

Step 2: (Optional but easier) Create access through the wheel well

• Loosen the front wheel lug nuts 1/2 turn using a 21mm socket and torque wrench (used here as a breaker) while the car is on the ground.
• Lift the front corner with a floor jack (rated 2-ton minimum) and support it with jack stands (pair, rated 2-ton minimum).
• Remove the wheel using a 21mm socket and 1/4" ratchet (or your ratchet that fits).
• Remove the front fender liner access clips/screws using a trim clip remover (specialty) (a forked tool that pops plastic clips out) and Phillips #2 screwdriver, then peel the liner back enough to reach the rear of the headlamp.
• When reinstalling the wheel later: Torque to 88 N·m (65 ft-lbs).

Step 3: Replace the halogen low beam bulb (H11) (if equipped)

• Reach the low-beam bulb at the rear of the headlamp housing.
• Disconnect the electrical connector by pressing the tab and pulling straight back (use nitrile gloves for grip).
• Rotate the bulb counterclockwise to unlock it, then pull it straight out.
• Install the new H11 bulb: insert it fully, then rotate clockwise to lock.
• Reconnect the connector until it clicks.
• If you accidentally touch the glass, clean it using isopropyl alcohol wipes and let it dry.

Step 4: Replace the halogen high beam bulb (9005) (if equipped)

• Locate the high-beam bulb (often closer to the inner side of the housing).
• Disconnect the connector by pressing the tab and pulling straight back.
• Rotate the bulb counterclockwise to unlock, then remove it.
• Install the new 9005 bulb, rotate clockwise to lock, then reconnect the plug.
• Replace bulbs in pairs for best color match.

Step 5: Replace the HID (xenon) low beam bulb (D2S) (if equipped)

• Confirm the battery negative cable is disconnected (use a 10mm socket if needed).
• Remove the rear dust cap (if present) by twisting/pulling it off by hand (use nitrile gloves for grip).
• Disconnect the igniter/connector from the rear of the bulb by twisting/pulling as designed (do not pry on wires).
• Release the bulb retaining spring or retainer (design varies) and carefully remove the bulb straight out.
• Install the new D2S bulb in the same orientation (tabs must seat fully), then re-latch the retainer.
• Reconnect the igniter/connector, then reinstall the dust cap.
• Do not touch the bulb glass; if touched, clean with isopropyl alcohol wipes.

Step 6: Reassemble the wheel well (if removed)

• Reposition the liner and reinstall clips using a trim clip remover (specialty) and Phillips #2 screwdriver.
• Install the wheel and hand-tighten lug nuts using a 21mm socket.
• Lower the car, then Torque to 88 N·m (65 ft-lbs) in a star pattern using a torque wrench (10-150 Nm range).

Step 7: Restore power (HID only) and function-check

• Reconnect the battery negative cable using a 10mm socket.
• Turn the headlights ON and verify low beam and high beam operation on both sides.

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✅ After Repair

• Verify both low beams match in color and brightness.
• Check high beams and turn signals to confirm you didn’t bump another connector loose.
• At night on a flat road, confirm the beam aim looks even left-to-right; if it’s noticeably off, the bulb may not be fully seated/locked.
• If a new bulb doesn’t light: re-check the connector seating and bulb lock position before assuming the bulb is bad.

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💰 DIY vs Shop Cost

Shop Cost: $120-$300 (parts + labor, halogen) / $250-$650 (HID)

DIY Cost: $25-$90 (halogen pair) / $80-$240 (HID pair)

You Save: $95-$410 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.2 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.