how to fix P0171 code in my BMW X3 G01 (2018-2024)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover if applicable.
  • Visually inspect the air intake duct, intake manifold, and throttle body for cracks or loose fittings.
  • Replace any damaged or loose components.
• Tools Required: Socket set, screwdriver set.

3. Check and Clean the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, usually found in the air intake duct.
  • Carefully disconnect the electrical connector from the MAF sensor.
  • Remove the MAF sensor from its housing.
  • Use MAF sensor cleaner to spray the sensor element and allow it to dry completely before reinstallation.
• Tools Required: Torx screwdriver, MAF cleaner.

4. Test and Replace Fuel Pressure Regulator (if necessary)

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail service port.
  • Turn the ignition on (do not start the engine) and record the pressure.
  • Compare the reading to the manufacturer’s specifications. If it is below specification, replace the fuel pump or fuel pressure regulator.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect and Repair Vacuum Hoses

• Sub-steps:
  • Visual inspection of all vacuum hoses connected to the intake manifold and other components.
  • Replace any hoses that are cracked, brittle, or disconnected.
• Tools Required: Pliers, replacement vacuum hoses.