How to Replace Intake Air Duct 04-07 Subaru Impreza-WRX
Difficulty: Intermediate · About 50 min · Subaru Impreza Wrx
Replace a damaged engine air intake duct on 2004–2007 Subaru Impreza WRX models while transferring the airbox, filter, sensor plug, and nearby line retainers.
Tools you will need
- 8 mm socket
- 10 mm socket and extensions
- Ratchet
Parts and supplies
- Engine air intake duct
Steps
Disconnect the intake components
With the engine cool and ignition off, remove the duct retaining bolts and lift the duct clear. Unplug the mass airflow sensor by releasing its tab, then free the nearby coolant lines from their clips without opening the cooling system.
Remove the airbox
If fitted, unclip the throttle cable from the intake tube. Loosen the duct clamp, unlatch and lift the airbox cover, remove the filter, then remove the airbox fasteners and lift the box out carefully.
Transfer and seat the airbox
Guide the airbox back into its mounts without trapping hoses or wiring. Tighten its retainers securely, reinstall the clean filter, and seat the cover evenly before closing its latches.
Reconnect the intake duct
Fit the duct fully over its mating tube and tighten the clamp. Return the coolant lines and throttle cable to their retainers, then reconnect the airflow sensor until its connector lock clicks.
Final inspection
Reinstall the duct bolts and check that the intake path is sealed with no loose tools or pinched wiring. Start the engine and confirm it idles normally and no intake warning appears.
Check your vehicle’s repair manual for exact specifications and fit.