my BMW 3 Series F30/F31 (2012-2019) has a loud exhaust noise what's wrong

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Repair Exhaust Components

• Visual Inspection: Examine the entire exhaust system from the manifold to the tailpipe.

  • Look for cracks, holes, or rust.

• Repair or Replace Damaged Components:

  • If cracks or holes are found:
    • For small holes, use high-temperature exhaust sealant to patch.
    • For larger issues, cut out the damaged section and replace it with a new pipe.
  • If a muffler is damaged, unbolt it from the system and replace with a new muffler.

• Tighten Loose Connections:

  • Inspect all bolts and clamps along the exhaust system. Tighten any loose bolts or replace any missing hardware.

3. Replace Exhaust Hangers

• If hangers are damaged or worn:
  • Remove the old hangers using pliers.
  • Install new hangers, ensuring they securely hold the exhaust in place.

4. Reassemble and Test

• Reconnect any components that were removed for inspection or replacement.
• Reconnect the battery.
• Start the engine and listen for any remaining exhaust noise.