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Audi A4 B8: How to Replace Cabin Air Filter

Replace an old air filter in your Audi A4 B8 using these three simple steps.

By Charlie Gaston - March 21, 2016

This article applies to the Audi A4 B8 (2009-2016).

Practically anyone can replace the cabin air filter in the Audi A4 B8. The procedure is so easy, in fact, you won't ever consider taking your Audi back to the dealership for such a simple repair again. And at a low cost of approx. $25 (or less), why would you ever consider throwing your hard-earned dollars away on exorbitant labor and padded parts costs? The answer is, you shouldn't! So how will you know when is the correct time to replace an old cabin air filter? The correct answer is when you reach around 20,000 to 30,000 miles, or exactly one year.

If you begin smelling a chemical-like odor when you run your air conditioning after it's been dormant for some time, don't panic. This smell is normal and is often just the result of condensation sitting in the system. Other culprits could be a clogged air conditioning drain, however. If you find the odor especially problematic, your local dealer can apply a special solution to your air conditioning system to eliminate it. Changing your air filter could help if the issue is related to your filter (e.g., dust build up, trapped dirt, etc.).

Audi A4 B8 How to Replace Cabin Air Filter infographic

Materials Needed

  • NPM Charcoal Activated Cabin Air Filter

Step 1 – Purchase a replacement air filter

For the Audi A4 B8, you'll need to purchase the NPN Charcoal Activated Cabin Air Filter. When making your purchase online or at your local auto parts store or Audi dealership, you'll need to provide the following original equipment manufacturer (OEM) part number to place your order: 8K0 819 439A

This is the replacement cabin air filter you'll need to use in the Audi A4 B8.
Figure 1. This is the replacement filter you'll need to use in the Audi A4 B8.

Step 2 – Remove the old cabin air filter

  • Head to the glove box, which is where your cabin air filter is housed.
  • There are three retaining screws holding a plastic panel in place.
  • Remove all three screws by hand, and then pull the plastic panel off while exerting a quick tug.
  • Next, you will see a hard, plastic cover.
  • Go ahead and remove it by pushing it to the right.
  • Now that you can see your filter, go ahead and grab it by the hand and remove it.
  • The cabin air filter is housed under the glove box
    Figure 2. The cabin air filter is housed under the glove box.
  • These are the screws you'll need to remove
    Figure 3. These are the screws you'll need to remove.
  • Slide the hard, plastic cover to the right
    Figure 4. Slide the hard, plastic cover to the right.
  • Remove the old filter
    Figure 5. Remove the old filter.

Step 3 – Install the new cabin air filter

With the old air filter now removed, go ahead and slide your replacement air filter into place. Once your new air filter is securely in place, grab your panels and re-install them, using the appropriate holding screws where necessary.

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