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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check for any visible cracks or loose fittings in the air intake duct and replace if necessary.
• Inspect the air filter; replace if dirty or clogged.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, torx screwdriver
• Remove the MAF sensor using the torx screwdriver.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstallation.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading. Compare it to manufacturer specifications (typically around 50-60 psi for BMW).
• If low, inspect the fuel pump and fuel filter for issues.

5. Inspect Vacuum Hoses

• Tools Required: Visual inspection tools
• Thoroughly inspect all vacuum hoses for cracks or disconnections. Replace any damaged hoses.

6. Replace Oxygen Sensors (if necessary)

• Tools Required: Oxygen sensor socket, wrench set
• If the oxygen sensors are found to be faulty, use the oxygen sensor socket to remove and replace the sensors.