how to address P0171 code in my BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the vehicle battery to ensure safety.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or loose connections.
  2. Tighten or replace any damaged hoses.
  3. Check the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver, gloves
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray the MAF sensor with MAF cleaner and allow it to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine to check the static fuel pressure.
  3. Compare the reading to manufacturer specifications; if low, check the fuel pump and filter for blockages.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter
• Sub-steps:
  1. Disconnect the fuel injectors' electrical connectors.
  2. Use a multimeter to check the resistance of each injector and ensure they are within specifications.
  3. If injectors are clogged, clean them using a fuel injector cleaning kit or replace as needed.