my BMW 5 Series F10/F11 (2010-2017) has a burnt smell coming from under the hood

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, laser thermometer, basic hand tools (socket set, screwdrivers).
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Electrical Issues

• Inspect Wiring:

  • Locate any burnt or frayed wiring.
  • Cut out damaged sections and splice in new wire of the same gauge.
  • Use heat-shrink tubing to insulate connections.

• Replace Damaged Components:

  • If the alternator or other components are burnt, remove them using a socket set.
  • Install new parts according to manufacturer specifications, ensuring all connections are secure.

3. Fix Fluid Leaks

• Identify and Repair Leaks:
  • If cooling system leaks are found, replace the affected hoses or gaskets.
  • Use a coolant stop leak product if applicable, or replace with manufacturer-specified coolant.

4. Replace Belts and Hoses

• Replace Worn Components:
  • Remove the serpentine belt by loosening the tensioner.
  • Replace any cracked or melted hoses, ensuring proper routing and securing with clamps.

5. Reconnect Battery and Test

• Reconnect the battery, ensuring all connections are clean and tight.
• Start the engine and monitor for any further burnt smell or unusual noises.