Where is the cabin air filter located in an Audi A4?
2 Answers
The Audi A4 has two cabin air filters: one is the intake air filter located at the lower left of the engine compartment cover panel, and the other is the blower motor filter. Below is a detailed guide on replacing the cabin air filters in an Audi A4: 1. Replacing the engine compartment cabin air filter: The intake air filter is situated at the lower left of the engine compartment cover panel. First, remove the leftmost foam piece, then lift the sealing strip to reveal the cover panel and access the filter. The filter is housed in a rectangular frame; release the frame's securing clips to remove it entirely. Install the new cabin air filter and clean the intake duct. 2. Replacing the blower motor cabin air filter: The blower motor filter is located above the passenger side footwell, concealed by a trim panel secured with plastic screws that can be unscrewed by hand. After removing the panel, you'll find an elongated cover; press the clip on the right side of the cover to detach it. Pull out the old filter and replace it with a new one.
When I first drove the Audi A4, I was also confused about where the cabin air filter was located. Later, I figured it out myself—it’s hidden behind the glove compartment on the passenger side. Open the glove box to its maximum angle, peek inside, and you’ll see a small panel or clips blocking it. Pry it open to reveal the filter slot. I replace mine every six months, checking it before summer and winter. Buying the filter myself costs just 30-40 yuan, and replacing it is simple: pull out the old filter and insert the new one, making sure not to install it backward (follow the arrow direction). This part is crucial—it prevents dust and pollen from affecting respiratory health. If not replaced, the AC can accumulate dust and develop a foul odor, ruining the driving experience. The location may vary by model year; for the B9 generation, it’s still behind the glove box, but it’s best to check the manual’s diagram to confirm and avoid damaging parts by forcing them open.
