how to repair the P0171 code on my BMW X3 F25 (2011-2018)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Air Intake Components

• Tools Required: Socket set, screwdriver set, vacuum gauge.
• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Inspect the air filter; replace if clogged or dirty.
  3. Check the throttle body for carbon buildup and clean it using throttle body cleaner.
  4. Reinstall the air duct ensuring all clamps are tight.

3. Check and Replace Vacuum Lines

• Tools Required: Pliers, hose cutter.
• Sub-steps:
  1. Identify and trace all vacuum lines from the intake manifold.
  2. Replace any cracked or damaged hoses.
  3. Ensure all connections are secure and free from leaks.

4. Inspect and Clean the MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver set.
• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Remove the sensor carefully to avoid damaging it.
  3. Clean the sensor with MAF cleaner and let it dry completely.
  4. Reinstall the MAF sensor and ensure it is correctly seated.

5. Fuel System Check

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
  3. Compare the reading to the manufacturer's specifications; replace the fuel pump or filter if the pressure is low.