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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
  • Replace any damaged hoses or components.

3. Clean or Replace Mass Air Flow (MAF) Sensor

• Tools Required: MAF cleaner or electrical contact cleaner
• Sub-steps:
  • Disconnect the MAF sensor electrical connector.
  • Remove the MAF sensor from the air intake duct (usually secured by screws or clips).
  • Clean the sensor element carefully with MAF cleaner. Avoid touching the sensor with fingers.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Start the engine and check the fuel pressure against manufacturer specifications (typically around 50-60 psi for many Volvos).
  • If pressure is low, check the fuel pump, filter, and lines for blockages or failures. Replace as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit or ultrasonic cleaner (if thorough cleaning is needed)
• Sub-steps:
  • Remove the fuel rail with the injectors attached.
  • Clean the injectors using a cleaning kit or ultrasonic cleaner.
  • Reinstall the injectors and fuel rail, ensuring all seals are intact.