🔧 Flex - Engine Air Filter Replacement

Your Flex’s engine air filter sits inside the air box and keeps dust/debris from entering the engine. Replacing it restores proper airflow, helps fuel economy, and protects the engine from wear.

Difficulty Level: Beginner | Estimated Time: 0.25-0.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns from hot components.
• ⚠️ Keep fingers/tools clear of the radiator fans; they can turn on unexpectedly.
• ⚠️ Do not drop dirt into the open air box or intake tube.
• ⚠️ Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Flat-blade screwdriver
• 7mm socket
• 1/4" drive ratchet
• Small flashlight
• 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 15–30 minutes if it was running.
• Have a shop towel ready so you can wipe the air box sealing surface.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the air filter housing

• Look for the black plastic air box near the front of the engine bay with a large intake tube attached.
• Air box = the plastic “case” that holds the filter.

Step 2: Unclip the air box cover

• Use a flat-blade screwdriver to help release the metal retaining clips if they’re tight.
• Flip all clips fully open so the top cover can lift.

Step 3: Loosen the intake tube clamp (if needed)

• If the cover won’t lift enough to remove the filter, use a 7mm socket with a 1/4" drive ratchet to loosen the hose clamp at the air box.
• Loosen only enough to let the intake tube flex—do not remove the clamp.

Step 4: Open the air box and remove the old filter

• Lift the air box lid upward carefully.
• Pull the old filter straight out.
• Use a flashlight to check the bottom of the air box for leaves or heavy dirt.

Step 5: Clean the sealing surfaces

• Use a shop towel to wipe the air box rim where the filter seals.
• Do not stuff the towel into the intake tube opening.

Step 6: Install the new air filter

• Set the new filter into the lower air box the same way the old one came out.
• Make sure it sits flat with no corners folded.
• A crooked filter can let dirt bypass.

Step 7: Close the air box and secure it

• Lower the lid and ensure it fully seats all the way around.
• Snap all the metal clips closed by hand (use the flat-blade screwdriver only if needed).
• If you loosened the clamp, tighten it with the 7mm socket and 1/4" drive ratchet until snug (do not overtighten).

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✅ After Repair

• Start the engine and let it idle for 20–30 seconds.
• Listen for a loud hissing/whistling that could indicate the air box lid isn’t sealed or the intake clamp is loose.
• Recheck that all clips are fully latched and the intake tube is seated evenly.

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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 0.3-0.5 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.