How often should the cabin air filter be replaced on a BMW?

2 Answers
SanHaley
07/24/25 12:06am
BMW's cabin air filter should be replaced every 20,000 kilometers. The cabin air filter is used to filter the air in the air conditioning system, ensuring fresh and clean air inside the vehicle. If the vehicle is used in a poor environment or there is an odor in the air conditioning system, it can be replaced earlier. The main components cleaned in a car's air conditioning system are the cabin air filter, air conditioning ducts, and evaporator box. The BMW 120i is a model from BMW's 1 Series. In terms of power, it is equipped with a 2.0-liter gasoline engine that delivers a maximum power output of 170 horsepower, paired with a 6-speed automatic transmission. In terms of dimensions, the BMW 120i measures 4462mm in length, 1803mm in width, and 1446mm in height, with a wheelbase of 2670mm.
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StJulian
08/10/25 7:54pm
My 5 Series has been driven for four years, and I basically change the cabin air filter every 10,000 km. During the last maintenance, the technician showed me the removed filter - it was completely clogged with leaves and dust, no wonder I always noticed an earthy smell when using the AC in summer. The dealership recommends replacement every 15,000 km or annually, but since northern China has lots of windblown sand, I always change it earlier. Actually, it's quite simple to DIY - there's an access panel behind the glove compartment, just remove two screws to replace it. But be careful not to buy the wrong model, as BMW filters vary in size across different model years. During the recent 618 shopping festival, I stocked up on Mann's activated carbon filters with PM2.5 filtration, which cost less than half the price of OEM parts.
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