🔧 CX-9 - Engine Air Filter Replacement

Your CX-9’s engine air filter sits in the air box (the black plastic housing connected to the intake tube). Replacing it helps the engine breathe properly, supports fuel economy, and can prevent dirt from entering the intake system.

Difficulty Level: Beginner | Estimated Time: 0.2-0.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work with the engine off and cool to avoid burns.
• ⚠️ Keep dirt and tools out of the open air box and intake tube.
• ⚠️ Do not start the engine with the air filter removed.
• ⚠️ 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
• Phillips screwdriver
• Small flashlight
• Clean shop towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Engine air filter - Qty: 1

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📋 Before You Begin

• 🅿️ Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool for 10–15 minutes if it was running.
• Have a clean shop towel ready so you can wipe the air box if needed.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the air filter housing

• Open the hood and look for the large black plastic air box connected to the intake tube.
• Use a small flashlight to find the air box cover fasteners (usually metal clips and/or Phillips screws).

Step 2: Release the air box cover

• Put on nitrile gloves and safety glasses.
• If your air box uses clips: unhook each clip by hand (press and pull it off the lip).
• If your air box uses screws: use a Phillips screwdriver to loosen/remove them.
• Tip: Keep screws in a pocket or tray.

Step 3: Open the air box and remove the old filter

• Lift the air box lid just enough to access the filter (you usually don’t need to remove the whole lid).
• Pull the old air filter straight out.
• Use a small flashlight to check the inside of the lower air box for leaves or dirt.

Step 4: Clean the air box sealing surface

• Use a clean shop towel to gently wipe the sealing edge where the filter sits.
• Do not push debris deeper into the intake path.

Step 5: Install the new air filter (correct orientation)

• Set the new filter into the lower air box the same way the old one came out.
• Make sure it sits flat and fully seated all the way around (no corners folded).
• Tip: If it won’t sit flat, it’s not aligned.

Step 6: Close and secure the air box

• Lower the air box lid carefully without pinching the filter.
• Re-latch the clips by hand, or use a Phillips screwdriver to reinstall/tighten the screws snug.
• Visually check the lid seam: it should look even all the way around.

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✅ After Repair

• Start the engine and let it idle for 20–30 seconds.
• Listen for any loud hissing/whistling that could suggest the air box isn’t sealed.
• Recheck that all clips/screws are secured and nothing was left in the engine bay.

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💰 DIY vs Shop Cost

Shop Cost: $60-$140 (parts + labor)

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

You Save: $45-$105 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.2-0.5 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.