Removing air cleaner housing (bottom section): Audi A5 (CABD, CALA, CALB)

🧭 Before you start

Disconnect G70 and its hose, remove the top section and filter, detach the N335 hose and connector if fitted, and lift the bottom section out of its retainers. Clean the housing and drain hose, inspect the intake path, refit the bottom section with the drain hose straight down, then seat the top section in its groove before bolting it and reconnecting G70.

Fits: Audi A5 (8T, 2007–2016)

Don't miss

• Route the water drain hose straight down without kinks.
• Seat the top section in the bottom section's groove before tightening bolts, or unmetered air gets in.
• Do not lubricate the housing retainer on refitting.
• Use a silicone-free lubricant on the intake hose and hose clips matching the originals.
• On cold-climate cars, check the warm air intake connection is engaged to its markings.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📐 37 workshop diagrams for CABD

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Unplug electrical connector (1) at air mass meter G70.
2. Release hose clip (2) securing air hose (going to turbocharger) and disconnect hose from air mass meter G70.
3. Remove all bolts (arrows) from air cleaner (top section) and lift out air cleaner (top section).
4. Take out old filter element.
5. Disconnect vacuum hose (3) (if fitted) at variable intake manifold change-over valve N335(1).

6. Release retainer for bottom section of air cleaner housing (press in rubber on left and right side and pull upwards). [Note: The variable intake manifold change-over valve N335 is not installed on certain equipment versions or on vehicles for certain export markets.Do not use lubricant when installing retainer.The bypass flap with variable intake manifold change-over valve N335 are not installed on certain equipment versions or on vehicles for certain export markets]
7. Disconnect electrical connector at variable intake manifold change-over valve N335 (if fitted).
8. Carefully take out bottom section of air cleaner housing. [Note: If the air filter element is very dirty or wet, dirt or water could reach the air mass meter G70 and affect the air mass value. This would lead to loss of power, since a smaller injection quantity is calculated.Always use genuine part for air filter element.Use a silicone-free lubricant when installing the intake hose.Secure all hose connections with the correct type of hose clips (same as original equipment): Parts catalogue]
9. If warm air intake hose is fitted (for countries with cold climates only), make sure that air intake connection has engaged properly (arrows) (pay attention to markings).
10. Check water drain hose (1) in air cleaner housing (bottom section) for dirt and other obstructions (clean if necessary).
11. Clean salt residue, dirt and leaves out of air cleaner housing (top and bottom sections); use a vacuum cleaner if necessary.
12. Check for salt residue, dirt and leaves in air mass meter and air intake hose (engine intake side).
13. Check for dirt in air duct leading to air filter element.
14. Re-attach electrical connector at variable intake manifold change-over valve N335 (if fitted).
15. Re-install bottom section of air cleaner housing. [Note: The water drain hose must be routed straight downwards and must not be kinked.]
16. Slide vacuum hose (3) (if fitted) back onto connection of variable intake manifold change-over valve N335(1).
17. Fit the top section of the air cleaner housing carefully on the bottom section, without using force. [Note: Before tightening bolts, make sure that the top section of the air cleaner housing is inserted into the groove on the bottom section (to prevent air leaks).]
18. Then secure top section of air cleaner housing to bottom section.
19. Ensure secure fit of air hose at air mass meter G70.
20. Re-connect electrical connector at air mass meter G70.
21. The remaining installation steps are carried out in the reverse sequence.

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