how to fix P0171 lean code in my Volvo XC60 Second Generation (2018-2024)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake

• Tools Required: Screwdriver set, hose clamps, flashlight.
• Inspect the air intake hoses for any cracks or leaks.
• If any damage is found, replace the affected hoses.
• Reconnect all hoses securely.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner, soft cloth.
• Locate the MAF sensor within the air intake duct.
• Disconnect the electrical connector.
• Remove the MAF sensor from the duct.
• Spray MAF cleaner onto the sensor wire and allow it to dry.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail test port.
• Connect the fuel pressure gauge to the test port.
• Turn the ignition key to the "ON" position (without starting the engine) to check pressure.
• Compare the reading with the manufacturer's specification; it should typically be around 58-65 psi for Volvo models.
• If the pressure is low, check the fuel pump and filter for issues.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine or carb cleaner.
• With the engine running, use a smoke machine to find any vacuum leaks around the intake manifold and gaskets.
• Alternatively, spray carb cleaner around suspected areas; if the idle changes, a leak is present.
• Repair or replace any faulty gaskets or hoses.

6. Verify Fuel Injector Function

• Tools Required: Fuel injector cleaning kit.
• If injectors are suspected, perform a cleaning process using the cleaning kit.
• Alternatively, replace any faulty injectors as required.