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

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, torque wrench, MAF cleaning spray.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold and throttle body.
  2. Use a smoke machine or carburetor cleaner to identify leaks.
  3. Replace any damaged or cracked hoses and gaskets.
  4. Reconnect all components securely.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor using the appropriate socket.
  4. Clean the sensor element with MAF cleaner spray.
  5. Allow the sensor to dry completely before reinstalling it.
  6. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel Pressure Test

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the ON position (do not start the engine) to check the fuel pressure reading.
  4. Compare the reading to the specified range for your vehicle.
  5. If low, inspect the fuel pump, fuel filter, and fuel injectors for issues.

5. Inspect and Replace Fuel Injectors (if necessary)

• Sub-steps:
  1. Remove the engine cover to access the fuel rail and injectors.
  2. Disconnect the fuel rail from the engine.
  3. Carefully remove each fuel injector from the fuel rail.
  4. Inspect for clogs or damages; clean or replace as necessary.
  5. Reinstall the fuel injectors and reassemble the fuel rail.