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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to check for vacuum leaks.
  • Replace any damaged hoses or clamps.
• Tools Required: Vacuum gauge, smoke machine, or carburetor cleaner.

3. Clean or Replace Mass Airflow Sensor

• Sub-steps:
  • Disconnect the MAF sensor electrical connector.
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor with MAF sensor cleaner, ensuring not to touch the sensor element.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.
• Tools Required: Torx screwdriver, MAF sensor cleaner.

4. Inspect Fuel System

• Sub-steps:
  • Check the fuel pump operation by listening for the pump's noise when the ignition is turned on.
  • Check fuel pressure using a fuel pressure gauge; it should meet the manufacturer's specifications (typically around 4-6 bar for most Volvo models).
  • If pressure is low, inspect the fuel filter and replace it if it is clogged, and consider replacing the fuel pump if necessary.
• Tools Required: Fuel pressure gauge, socket set for filter/pump removal.

5. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Use an OBD-II scanner to monitor the O2 sensors' readings.
  • If the readings are erratic or out of range, consider replacing the upstream oxygen sensor.
  • Disconnect the sensor, replace it, and reconnect the electrical connector.
• Tools Required: O2 sensor socket, wrench.