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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all intake hoses for cracks, loose connections, or wear.
  2. Tighten any loose clamps and replace damaged hoses.
  3. Check the intake manifold for leaks using a smoke machine or carburetor cleaner spray.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the sensor using a Torx screwdriver.
  4. Clean the MAF sensor with MAF cleaner spray; avoid touching the sensor elements.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Test and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (without starting) and check fuel pressure; it should meet manufacturer specifications (typically around 50-60 psi).
  3. If pressure is low, check the fuel pump and fuel filter for issues; replace if necessary.
  4. Inspect the fuel injectors; clean or replace if clogged.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0171 code from the ECM.
  3. Start the engine and monitor for any new codes.