how to fix P0174 code in BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake hoses for any cracks or loose connections.
  • Tighten any loose clamps and replace damaged hoses.
  • If leaks are found, replace the affected parts.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor using MAF sensor cleaner (do not touch the sensor with tools).
  • Reinstall the MAF sensor securely, ensuring all connections are tight.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start the engine) and observe the fuel pressure reading.
  • Compare the reading with manufacturer specifications; if it's low, check the fuel pump and fuel filter for issues.
  • If necessary, replace the fuel filter or fuel pump.

5. Inspect and Repair Vacuum Lines

• Sub-steps:
  • Trace all vacuum lines from the intake manifold and visually inspect for cracks or wear.
  • Replace any damaged or disconnected vacuum lines.
  • Use a smoke tester if needed to locate difficult-to-find leaks.