why does my BMW 3 Series F30/F31 (2012-2019) have an exhaust smell inside

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the vehicle battery to ensure safety during inspection.

2. Inspect and Repair Exhaust System

• Tools Required: Socket set, torque wrench, exhaust sealant (if needed)
• Sub-steps:
  1. Lift the vehicle securely using a jack and jack stands.
  2. Begin at the front of the exhaust system and work towards the rear.
  3. Inspect all exhaust components including the manifold, catalytic converter, and muffler for cracks or holes.
  4. Repair any leaks found using exhaust sealant or replace the affected parts as necessary.
  5. Ensure all bolts and clamps are securely tightened to manufacturer specifications.

3. Cabin Air Filter Replacement

• Tools Required: Screwdriver set
• Sub-steps:
  1. Locate the cabin air filter housing, typically found behind the glove box.
  2. Remove the glove box or access panel to expose the filter.
  3. Carefully remove the old cabin air filter, noting its orientation.
  4. Install the new cabin air filter, ensuring it is seated properly.
  5. Reassemble the glove box or access panel.

4. Ventilation System Check

• Tools Required: None
• Sub-steps:
  1. Start the vehicle and turn on the ventilation system to the highest setting.
  2. Check for any unusual noises or smells emanating from the HVAC system.
  3. Ensure that air is flowing properly through all vents and that there is no exhaust smell from the system.