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

Solution

1. Preparation

• Gather all tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent any electrical short circuits.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check all intake hoses and connections for leaks.
  • Inspect the rubber hoses for cracks or wear.
  • Replace any damaged hoses.
• Tighten any loose clamps and connections.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with the cleaner, allowing it to dry completely before reinstallation.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start the engine) and check the fuel pressure reading.
  • If the pressure is below specifications, inspect the fuel pump, filter, and fuel lines for issues.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors
• If fuel pressure is normal, perform a visual inspection of the fuel injectors for leaks and clogs.
• Clean or replace any faulty fuel injectors as necessary.

6. Test and Replace Oxygen Sensors (if needed)

• Tools Required: O2 sensor socket
• Use an O2 sensor socket to remove the bank 2 oxygen sensor.
• Test the sensor with a multimeter or replace it with a new one if it fails the test.