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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues during repairs.

2. Inspect and Repair Air Intake System

• Remove the air intake duct to access the MAF sensor.
• Inspect the ducting for cracks or loose connections; replace any damaged components.
• Tighten any loose clamps to ensure a secure fit.

3. Clean or Replace MAF Sensor

• If the MAF sensor appears dirty, use MAF sensor cleaner to gently clean the sensor element. Allow it to dry completely.
• If the sensor is defective, replace it with a new one. Follow the manufacturer's specifications for installation.

4. Check and Repair Fuel System

• Use a fuel pressure gauge to check the fuel pressure. Compare readings to manufacturer specifications.
• If fuel pressure is low, check the fuel pump and filter for blockages or failure. Replace as necessary.
• Inspect the fuel injectors using a noid light to ensure they are receiving adequate signal; replace any malfunctioning injectors.

5. Inspect Vacuum System

• Check all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• If applicable, check the intake manifold gasket for leaks and replace it if necessary.