how to fix P0171 code in Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:

  1. Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify leaks.
  3. Replace any damaged hoses or gaskets.

• Tools Required: Vacuum gauge, smoke machine (optional), basic hand tools.

3. Clean or Replace the Mass Airflow Sensor (MAF)

• Sub-steps:

  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the MAF sensor with MAF cleaner or replace it if damaged.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

• Tools Required: Torx screwdriver, MAF cleaner.

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 and check the fuel pressure.
  3. If pressure is below specifications, inspect the fuel pump and fuel filter for faults.
  4. Replace a faulty fuel pump or filter as necessary.

• Tools Required: Fuel pressure gauge, basic hand tools.

5. Inspect Fuel Injectors

• Sub-steps:

  1. Remove the intake manifold if necessary to access the fuel injectors.
  2. Inspect injectors for clogs or leaks.
  3. Clean or replace faulty injectors.

• Tools Required: Injector cleaning kit, basic hand tools, torque wrench.