RELEASED MAINTENANCE GUIDE
E91 cabin microfilter replacement
BMW 3 Series Touring · E91 LCI · 320i · N43B20
All six steps are released with current component-manufacturer fitment and installation evidence, including a six-fastener removal checkpoint. Confirm your exact vehicle and replacement part before starting.
FASTENERS & TIGHTENING
Check the hardware before you start
No separate verified fastener map is published for this guide. This does not mean no fasteners are involved. Follow the released steps and their cited specifications; if a required tightening or replacement rule is missing, stop and verify it.
How WrenchGuide treats fastener information
Material, reuse policy and tightening method are separate facts. Torque plus angle alone does not establish that a fastener is torque-to-yield or single-use. WrenchGuide will not invent a torque value or replacement rule.
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MY WORKSHOP JOURNAL
Remember how your car came apart.
Attach private notes and your own teardown photos to the exact procedure step. They stay on this device in the current local-first beta.
Confirm the vehicle and replacement filter
Take a quick photo before disconnecting or removing something you may need to identify during reassembly.