🔧 WRX - Engine Air Filter Replacement

Your WRX uses a panel-style engine air filter inside the airbox. Replacing it restores airflow, helps performance, and can improve fuel economy if the old filter is dirty.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep dirt/leaves out of the open airbox and intake tube.
• ⚠️ Don’t tug on wiring near the MAF sensor (the airflow sensor on the 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:

• Nitrile gloves
• Safety glasses
• Phillips screwdriver
• 10mm socket
• 1/4" ratchet
• Small flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Engine air filter (panel type) - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and turn the engine off.
• Open the hood and let the engine bay cool for 10–15 minutes if you just drove.
• Have a clean rag ready so you can wipe the airbox sealing surface.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the airbox

• With the hood open, find the black plastic airbox on the passenger-side of the engine bay (it connects to the intake tube).
• Use a small flashlight to see the clips/screws around the airbox lid.

Step 2: Unclip/loosen the airbox lid

• Release the metal clips around the airbox lid by hand.
• If your lid uses screws/bolts, loosen them using a Phillips screwdriver or 10mm socket with a 1/4" ratchet (only loosen enough to open the lid).
• Don’t remove the intake tube if not needed.

Step 3: Open the airbox and remove the old filter

• Lift the airbox lid straight up and slightly toward you.
• Pull the old filter straight out.
• Use the small flashlight to check for leaves or sand inside the lower airbox.

Step 4: Clean the airbox sealing surface

• Wipe the airbox rim (where the filter seals) with a clean rag (use your nitrile gloves).
• Make sure nothing falls down into the intake opening.

Step 5: Install the new filter

• Slide the new filter into the lower airbox the same way the old one came out.
• Make sure it sits flat and fully seated all the way around (no corners folded).
• If the filter has an “UP” mark or airflow arrow, match it exactly as the old one.

Step 6: Close and secure the airbox

• Lower the lid back into place, making sure it’s aligned and not pinching the filter.
• Re-latch the metal clips by hand.
• If there were screws/bolts, snug them using a Phillips screwdriver or 10mm socket with a 1/4" ratchet (do not overtighten—plastic can crack).

Step 7: Quick final check

• Confirm the lid sits evenly all the way around.
• Confirm no tools or rags are left in the engine bay.

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✅ After Repair

• Start the engine and let it idle for 20–30 seconds.
• Listen for hissing/whistling that could indicate the airbox lid isn’t sealed.
• If a check engine light appears, re-check that the airbox is fully closed and you didn’t disturb the MAF sensor connector.

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💰 DIY vs Shop Cost

Shop Cost: ₹1,000-₹2,500 (parts + labor)

DIY Cost: ₹600-₹1,800 (parts only)

You Save: ₹400-₹700 by doing it yourself!

Shop labor rates vary but typically run ₹800-₹2,000/hour. This repair takes a shop approximately 0.2-0.4 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.