what causes engine code P0171 in my Volvo XC60 Second Generation (2018-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, basic socket set, screwdrivers, vacuum gauge, multimeter, and MAF cleaner.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. Use a vacuum gauge to check for leaks in the intake system.
  3. If leaks are found, replace the damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the sensor using the appropriate socket.
  3. Clean the MAF sensor with MAF cleaner spray; allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Start the engine and check the fuel pressure; it should match the manufacturer specifications (consult service manual).
  3. Replace the fuel filter if pressure is low or if there are any signs of blockage.

5. Test Oxygen Sensors

• Sub-steps:
  1. Use a multimeter to test the voltage output of the upstream oxygen sensor.
  2. If the voltage readings are out of specification, replace the oxygen sensor.

6. Update ECM Software

• Sub-steps:
  1. Connect the OBD-II scanner to the vehicle and check for ECM software updates.
  2. Follow the scanner prompts to update the software if necessary.