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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers.
• Instructions:
  1. Use a vacuum gauge to check for leaks at the intake manifold and associated hoses.
  2. If a leak is found, replace damaged hoses and re-secure loose connections.
  3. Reconnect the battery terminal after repairs.

3. Check and Clean the MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Instructions:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the MAF sensor electrical connector.
  3. Remove the MAF sensor using a screwdriver.
  4. Clean the sensor with MAF sensor cleaner and allow it to dry.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge, fuel injector cleaning kit.
• Instructions:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) and check the fuel pressure against manufacturer specifications.
  3. If the pressure is low, inspect the fuel pump and fuel filter for issues.
  4. Use a fuel injector cleaning kit to clean clogged fuel injectors if necessary.

5. Verify Engine Coolant Temperature Sensor

• Tools Required: Multimeter.
• Instructions:
  1. Locate the ECT sensor on the engine.
  2. Disconnect the electrical connector from the sensor.
  3. Use a multimeter to check the resistance of the sensor against specifications (consult service manual).
  4. Replace the sensor if the readings are out of range.