how to address the P0171 code in my Volvo XC60 Second Generation (2018-2024)

Solution

1. Preparation

• Gather tools and materials:
  • OBD-II scanner
  • Fuel pressure gauge
  • Socket set
  • Cleaning supplies for MAF sensor
  • Replacement parts as needed (e.g., gaskets, MAF sensor)
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect Air Intake System

• Remove the air intake duct from the throttle body.
• Inspect for cracks or loose fittings; replace any damaged components.
• Reconnect the duct securely after inspection.

3. Check and Clean MAF Sensor

• Disconnect the electrical connector from the MAF sensor.
• Carefully remove the sensor from the intake system.
• Use MAF sensor cleaner to clean the sensor element; allow it to dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on without starting the engine to check the fuel pressure reading.
• Compare the reading to the manufacturer’s specifications. If it’s low, inspect the fuel pump and filter for issues.
• If necessary, replace the fuel filter and consider replacing the fuel pump if the pressure remains inadequate.

5. Check for Vacuum Leaks

• Visually inspect all vacuum hoses and gaskets around the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner around suspected areas while the engine is idling to identify leaks.
• Replace any faulty hoses or gaskets as needed.

6. Verify Oxygen Sensor Function

• Use the OBD-II scanner to monitor the live data from the oxygen sensors.
• If readings are outside of normal parameters, consider replacing the oxygen sensor(s) that are malfunctioning.