🔧 Focus - Cabin Air Filter Replacement

Your Focus cabin air filter cleans the air going through the HVAC system (heat/AC). Replacing it helps restore airflow, reduce musty smells, and keep dust/pollen out of the cabin.

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

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⚠️ Safety & Precautions

• ⚠️ Turn the ignition off and remove the key before working under the dash.
• ⚠️ Use gentle force on plastic panels to avoid cracking clips.
• ⚠️ No battery disconnect is required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Trim removal tool (plastic pry tool)
• 7mm socket
• 1/4" drive ratchet
• Short 1/4" drive extension (3")
• Torx T20 screwdriver
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Cabin air filter - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Slide the passenger seat all the way back for space.
• Empty the glovebox so nothing falls out.
• Have a flashlight ready; the filter area is low and tucked in.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the passenger-side lower trim panel

• Move to the passenger footwell and aim your flashlight under the glovebox.
• Use a trim removal tool (plastic pry tool) (a plastic wedge used to pop panels without scratching) to carefully pry down the lower kick/under-dash panel if equipped.
• If you see screws, remove them using a 7mm socket with a 1/4" drive ratchet and 3" extension.

Step 2: Lower the glovebox (if needed for access)

• Open the glovebox.
• On the right side, disconnect the glovebox “damper” strap by gently pulling it off its peg (use your fingers, or a trim removal tool if tight).
• Squeeze the glovebox sides inward by hand to clear the stops, then let the glovebox swing down slowly.
• If your glovebox has screws along the bottom/edge, remove them with a Torx T20 screwdriver or 7mm socket (use whichever fastener you actually have).

Step 3: Locate the cabin filter cover

• Look behind/under the glovebox area toward the center console side.
• You’ll see a small rectangular access door (the cabin filter cover) on the HVAC housing.

Step 4: Remove the cabin filter cover

• Release the tabs by hand; if your fingers can’t fit, use a trim removal tool gently.
• Pull the cover straight off and set it aside.

Step 5: Remove the old cabin air filter

• Grab the end of the filter and slide it out slowly.
• Tip: Keep it level to avoid spilling debris.
• If it’s hard to pull out, wiggle it slightly while pulling—don’t force the plastic housing.

Step 6: Install the new cabin air filter

• Check the airflow arrow on the filter frame.
• Install it in the same direction as the old one came out (match the arrow direction you observed).
• Slide the filter in fully until it seats flat in the housing.

Step 7: Reinstall the cover and panels

• Reinstall the filter cover and press until the tabs click in.
• Raise the glovebox back up, then reattach the damper strap by pushing it onto its peg.
• Reinstall any screws using a Torx T20 screwdriver or 7mm socket with a 1/4" drive ratchet.
• Snap the lower trim panel back into place and reinstall any 7mm screws if removed.

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✅ After Repair

• Start the engine and run the fan on medium, then high, to confirm strong airflow.
• Switch between fresh air and recirculation to verify normal operation.
• If you had a musty smell, run the fan for a few minutes with the AC on to help dry the HVAC box.

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💰 DIY vs Shop Cost

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

DIY Cost: $15-$35 (parts only)

You Save: $65-$125 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.