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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge
• Sub-steps:
  1. Remove the engine cover (if applicable).
  2. Visually inspect all hoses and connections from the air filter to the intake manifold for cracks or disconnections.
  3. Use a vacuum gauge to test for leaks; replace any damaged hoses.
  4. Reconnect all hoses securely.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor, usually between the air filter and throttle body.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor from the air intake duct.
  4. Spray MAF sensor cleaner onto the sensor element; do not touch it with fingers or tools.
  5. Allow it to dry and reinstall the MAF sensor and connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and find the Schrader valve.
  2. Connect the fuel pressure gauge to the Schrader valve.
  3. Turn the ignition to the "ON" position without starting the engine to check for initial pressure.
  4. Start the engine and observe the pressure; it should meet the manufacturer's specifications.
  5. If pressure is low, inspect the fuel pump and filter for issues and replace if necessary.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if cleaning is needed)
• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Inspect injectors for clogs or leaks; replace any faulty injectors.
  3. If cleaning, use a fuel injector cleaning kit following the manufacturer's instructions.
  4. Reinstall the fuel rail with new O-rings if necessary, ensuring a proper seal.