how to fix P0171 lean code in Volvo XC60 First Generation (2008-2017)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge
• Remove the air intake duct to access the MAF sensor.
• Check all rubber hoses and connections for cracks or looseness. Replace any damaged components.
• Reinstall the air intake duct securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner (specific to MAF sensors)
• Carefully remove the MAF sensor from the air intake system.
• Spray the MAF sensor with the cleaner and allow it to dry completely.
• Reinstall the MAF sensor, ensuring it is secured properly.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "ON" position (do not start the engine) and check if the pressure meets specifications (usually around 50-60 psi for most engines).
• If the pressure is low, inspect the fuel pump and fuel filter for clogs or failures. Replace as necessary.

5. Inspect and Test Fuel Injectors

• Tools Required: Injector cleaning kit or multimeter for testing
• Remove the fuel injectors from the engine.
• Clean the injectors using an injector cleaning kit or have them professionally cleaned.
• Test the injectors’ electrical connection with a multimeter to ensure they are functioning correctly.