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Audi A4 (B5). Changing the Cabin Air Filter

Tools needed:

Ratchet and socket set
Flat and Phillips head screwdriver
Car keys
30mins of time

Park windshield wipers in the 12 o'clock position.

Remove the rubber strip by pulling it towards the front of the car.

Pull the battery firewall cover out towards the front of the car.

Cabin air filter is underneath the windshield plastic cover on the passenger side. Turn the screws and then use the ratchet and remove the bolt in the middle of the picture and pull the cover out towards the front of the car.

There is a drip pan that needs to be pulled out hardly but gently towards the front. Make sure that the wholes on the drip pan are clear from any debris before you put the thing back in.

Pull the old filter out and clean the now exposed cabin filter box with a moist sponge to remove any dust that is in there.

Old filter versus new... yeah it needed replacement.

The part number on the air filter that bought was CU 3955 and was a special order at AutoZone for $19.

Put everything back together in the reverse order and you should be set.


Andre said...

Hi. I have a A4 1.8 Turbo. I am in South Africa. My Audi feels very sluggish, what all can I do myself. I love this DIY with all the pictures you include. Thanks for that. So where to start and what all to do to give my Audi more go.....

Andre said...

Hi, I have a A4 1.8 Turbo. I am in South Africa...........
I love this site for the DIY stuff. My Audi feels sluggish, what can I do. It is still stock standard.

Gaz said...

Thanks for the details and photos.
What about the plastic lid covered in light black/grey foam. This soft foam is perishing on our 2000 a4 b5 v6 model and being sucked through and out the air vents! What does this cover do?
Regards Gaz

Gaz said...

And to answer my own question. It is the vent flap to open/close outside air flow to inside the car. The padding foam must be just to create a better seal. Solution leave closed most of the time.

james gardez said...

thanks for this great information about air filters i am very glad to read your article.
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