how to troubleshoot P0171 code on BMW X5 G05 (2019-2024)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover (if applicable) using a socket set.
  • Visually inspect all air intake hoses and connections for signs of wear or damage.
  • If any leaks are found, replace the damaged hoses or clamps.
  • Ensure the intake manifold is securely fastened and free of leaks.

3. Check and Clean MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector carefully.
  • Remove the MAF sensor using a Torx screwdriver.
  • Clean the sensor with MAF sensor cleaner and let it dry completely before reinstalling.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  • Locate the fuel rail and connect a fuel pressure gauge to the designated test port.
  • Turn the ignition to the "On" position (do not start) to prime the fuel system and check the pressure reading.
  • Compare the reading to the manufacturer’s specifications; if pressure is low, check the fuel pump and filter.
  • If necessary, replace the fuel filter or pump based on findings.

5. Inspect Vacuum Lines

• Sub-steps:
  • Perform a visual inspection of all vacuum lines connected to the intake manifold.
  • Replace any damaged or cracked lines.
  • Ensure all connections are secure and free of leaks.