how to fix P0171 code in Volvo XC60 536 (2017-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery.
• Ensure the vehicle is on a level surface and securely raised if needed.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, flashlight
• Inspect the air intake hose and connections for any signs of wear or damage.
• Tighten any loose clamps and replace any damaged hoses.
• Check the throttle body for cleanliness and ensure it operates smoothly.

3. Clean or Replace Mass Airflow Sensor (MAF)

• Tools Required: Torx screwdriver, MAF cleaner
• Detach the MAF sensor from the intake tube.
• Spray MAF cleaner on the sensor elements and allow it to dry completely.
• Reinstall the MAF sensor and ensure all connections are secure.

4. Fuel System Check

• Tools Required: Fuel pressure gauge
• Attach the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "On" position (do not start the engine) and observe the pressure reading; it should match the specifications in the service manual.
• If pressure is low, check the fuel pump and fuel filter for clogs and replace if necessary.

5. Oxygen Sensor Check

• Tools Required: Multimeter
• Disconnect the upstream oxygen sensor.
• Use a multimeter to check the voltage output; it should fluctuate between 0.1 to 0.9 volts.
• If readings are outside the normal range, consider replacing the oxygen sensor.

6. Reassemble and Clear Codes

• Reconnect any components that were removed or inspected.
• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0171 code.
• Test drive the vehicle to ensure the check engine light does not reappear.