2009–2016 Audi A4

2009-2016 Audi A4 - Engine Air Filter Replacement

By Tom Becker ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026

🔧 Easy 10-20 minutes $20 DIY

Save $70 by doing it yourself! Shop cost: $90

Quick answer: Engine Air Filter Replacement on a 2009–2016 Audi A4 is rated Easy and takes about 10-20 minutes. You'll need 2 tools for this job, and parts cost about $20. This guide walks you through the full job step by step, including the mistakes to avoid.

Quick Video Tutorial

Parts You Need

Total Cost

$20.00

Part Name	Part Number	Price	Buy
Engine air filter	—	$20.00	Amazon

About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.

💡 Pro tip: Order all parts at once to save on shipping

Step-by-Step Instructions

Follow these steps carefully

Prep and locate the air box

Park on level ground, brake set, ignition off. Pop the hood and find the box — passenger side of the engine bay on the A4. Let a hot engine cool first. No tools needed — the box is clip-held.

Open the air filter housing

Pull the triangular rubber intake piece off the front of the airbox with a twist-and-pull motion — it comes off by hand. Next, loosen the hose clamp where the intake hose meets the top of the box and work the hose free. Now back out the six T30 Torx screws around the airbox lid and lift the lid off with your hands.

Remove the old filter and clean

Lift the old filter out. Wipe the box interior with a clean rag and check the drain hole for blockages. Compare old and new side by side for identical size and pleat count.

Install the new filter

Slide the new panel filter into the lower box exactly as the old one sat, with the pre-filter element toward the bottom, and press around the rubber sealing edge to confirm it sits flat with no gaps or folded pleats. The filter should drop in level; if it rocks or sits proud, it's upside down or the wrong part for the B8.

Reseal and verify

Set the lid back on and run the six T30 screws in evenly — snug, not forced, since they thread into plastic. Reattach the intake hose to the top of the box and tighten its clamp, refit the triangular rubber intake piece at the front, and plug the MAF connector back in until it clicks. Start the engine and listen at idle: a whistling intake note means the lid isn't sealed, and a rough idle with a warning light points to the MAF connector not being seated.

All Done!

Test your repair before closing everything up. If something doesn't work right, double-check your steps.

⚠️ Common Mistakes to Avoid

• Installing the filter upside down or unseated so unfiltered air bypasses the element
• Leaving debris in the housing that then gets sucked into the intake
• Forcing clips/screws and cracking the plastic air box lid
• Reusing a heavily clogged filter instead of replacing it