my BMW 3 Series F30/F31 (2012-2019) is using more gas than usual

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the battery to prevent electrical issues during repairs.

2. Inspect and Replace Air Filter

• Sub-steps:
  1. Open the hood and locate the air intake housing.
  2. Remove the screws or clips securing the air filter cover.
  3. Take out the old air filter and inspect it for dirt and damage.
  4. Install a new, clean air filter into the housing.
  5. Reattach the air filter cover and secure it properly.
• Tools Required: Screwdriver set

3. Check and Replace Fuel Filter (if applicable)

• Sub-steps:
  1. Locate the fuel filter, typically along the fuel line under the vehicle.
  2. Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  3. Disconnect the fuel lines (use a line wrench).
  4. Remove the old fuel filter and replace it with a new one.
  5. Reconnect fuel lines and replace the fuel pump fuse.
• Tools Required: Line wrench, fuel line disconnect tool

4. Clean or Replace Fuel Injectors

• Sub-steps:
  1. Remove the intake manifold if necessary to access the fuel injectors.
  2. Disconnect the electrical connectors from the fuel injectors.
  3. Remove the fuel rail and carefully take out the injectors.
  4. Clean injectors using an ultrasonic cleaner or replace them if necessary.
  5. Reassemble the fuel rail and reconnect all components.
• Tools Required: Socket set, injector puller (if necessary)

5. Inspect Exhaust System

• Sub-steps:
  1. Visually inspect the exhaust system for any leaks or damage.
  2. Use a smoke test to identify any hidden leaks if necessary.
  3. Repair or replace any damaged sections of the exhaust.
• Tools Required: Exhaust pipe cutter, clamps