how to fix P0174 code on BMW X5 F15 (2014-2019)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold.
  • Use smoke testing or carburetor cleaner to locate any leaks.
  • Replace any cracked or damaged hoses.
• Tools Required: Smoke machine or carburetor cleaner, flashlight.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Disconnect the MAF sensor connector.
  • Remove the MAF sensor from the intake duct.
  • Clean the MAF sensor with MAF cleaner spray.
  • If cleaning does not resolve the issue, replace the MAF sensor.
• Tools Required: Torx screwdriver, MAF cleaner spray.

4. Check and Repair Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure.
  • If the pressure is low, inspect the fuel pump and fuel filter for clogs or failures. Replace as necessary.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the intake manifold to access the fuel injectors.
  • Check for leaks around the injector seals.
  • Test each injector for proper operation using a multimeter.
  • Replace any faulty injectors.
• Tools Required: Socket set, multimeter.