how to fix P0171 code in my BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Air Leaks

• Tools Required: Screwdriver, pliers
• Steps:
  1. Visually inspect all air intake hoses and connections.
  2. Tighten any loose clamps or replace damaged hoses.
  3. If any hoses are cracked, replace them with new ones.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray the MAF sensor with a dedicated cleaner and allow it to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Steps:
  1. Locate the fuel rail pressure test port.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure reading.
  4. Compare the reading to the manufacturer specifications. If low, proceed to replace the fuel pump.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or solvent
• Steps:
  1. Disconnect the fuel lines from the injectors.
  2. Remove the injectors from the fuel rail.
  3. Clean the injectors using a cleaning kit or solvent.
  4. Reinstall the injectors and reconnect the fuel lines.