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How to Replace the Air Filter in a BMW 3 Series?

2 Answers

DiLukas

07/24/25 10:58am

BMW 3 Series air filter replacement steps are: 1. First, open the hood and locate the air filter near the throttle body. Remove the engine cover locking mechanism cable from the clip. 2. Use a flat-head screwdriver to loosen the self-tightening clamp on the intake pipe, disconnect the air flow meter plug, and remove the entire intake box. 3. Release the intake box cover clamp, open the intake box, remove the old filter, and replace it with a new one. Additional information: The functions of the air filter are: 1. The engine needs to intake a large amount of air during operation. If the air is not filtered, the dust suspended in the air will be sucked into the cylinders, accelerating the wear of the piston group and cylinders. 2. The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand particles from the air, ensuring that sufficient and clean air enters the cylinders.

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StMichael

08/11/25 5:58am

I've changed the air filter on my BMW 3 Series several times - it's a straightforward job. Step one is to pop the hood and locate the plastic filter housing, usually on the right side of the engine bay. Loosen a few Phillips-head screws or spring clips to open the cover. When removing the old filter, use a vacuum to clean dust from the housing - debris falling into the engine could cause trouble. The new filter has an arrow indicating airflow direction that must point toward the engine; reversed installation causes airflow issues. Securely fasten the cover and tighten the screws - a clean job takes under 10 minutes. Remember to replace it every 12,000-15,000 miles for better fuel efficiency and engine protection. Aftermarket filters cost just tens of dollars, saving hundreds compared to dealership prices, plus it's satisfying DIY work.

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