🔧 RX350 - Engine Air Filter Replacement

Replacing the engine air filter helps your A4—sorry, your RX350—breathe properly so it can run smoothly and keep good fuel economy. This job is quick because the filter sits inside the air box (a plastic housing) near the front of the engine bay.

Difficulty Level: Beginner | Estimated Time: 10-20 minutes

Assumption: Stock air box (no aftermarket intake).

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⚠️ Safety & Precautions

• ⚠️ Turn the engine off and let it cool 10 minutes (hot parts can burn you).
• ⚠️ Keep fingers/tools away from the radiator fans (they can turn on unexpectedly).
• ⚠️ Do not run the engine with the air filter removed (dirt can enter the engine).
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Flashlight
• Flathead screwdriver
• 10mm socket
• 1/4" drive ratchet

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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 a level surface and shift to P.
• Set the parking brake.
• Open the hood and support it securely.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the air filter housing (air box)

• Use a flashlight and look for a large black plastic box with an intake tube connected to it near the front/side of the engine bay.
• The intake tube is the large plastic/rubber duct that brings air to the engine.

Step 2: Unclip or loosen the air box cover

• Put on nitrile gloves and safety glasses.
• If your air box uses metal clips, release them using your fingers or a flathead screwdriver (gently pry if they’re tight).
• If your air box has a hose clamp on the intake tube, loosen it using a 10mm socket and 1/4" drive ratchet. A hose clamp is the metal band that tightens around the tube.
• Lift the air box top/cover enough to access the filter (you usually don’t need to fully remove the cover).

Step 3: Remove the old air filter

• Pull the filter straight out by hand.
• Use a flashlight to inspect the inside of the air box for leaves/sand.
• Tip: Don’t let debris fall into the intake.

Step 4: Install the new air filter

• Insert the new engine air filter into the air box the same way the old one came out.
• Make sure the filter sits flat and the edges seal all the way around (no corner folded or pinched).

Step 5: Reassemble the air box

• Lower the air box cover back into place by hand.
• Re-latch the clips (use a flathead screwdriver only if needed to guide them).
• If you loosened a clamp, tighten it using a 10mm socket and 1/4" drive ratchet (snug, not crushing the tube).
• Do a quick visual check that the intake tube is fully seated and nothing is left loose.

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✅ After Repair

• Start the engine and let it idle for 20-30 seconds.
• Listen for any hissing/whistling (can mean the air box isn’t sealed).
• Re-check the clips/clamp by hand after the test start.

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💰 DIY vs Shop Cost

Shop Cost: $40-$120 (parts + labor)

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

You Save: $25-$85 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.