how to fix P0171 code on my Volvo XC60 536 (2017-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface with the engine cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Air Intake Components

• Sub-steps:
  1. Remove the air filter housing and inspect the air filter. Replace if dirty.
  2. Check the air intake hose for cracks or loose connections; replace if necessary.
  3. Clean the MAF sensor using MAF cleaner spray (do NOT touch the sensor element).

3. Examine Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail and check for appropriate pressure (refer to manufacturer specifications).
  2. If pressure is low, check the fuel pump and replace the fuel filter if clogged.
  3. Inspect fuel injectors for clogs or leaks; clean or replace as necessary.

4. Check and Replace Vacuum Lines

• Sub-steps:
  1. Visually inspect all vacuum lines for signs of wear, cracks, or disconnections.
  2. Replace any damaged vacuum lines.

5. Test and Replace Oxygen Sensors

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