what does code P0171 mean for my Toyota Camry Eighth Generation (2018-present) and how to fix it?

Solution

1. Preparation

• Gather tools and ensure you have the necessary parts.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify leaks while the engine is running.
  3. Replace any damaged hoses or gaskets found during inspection.
• Tools Required: Smoke machine or carburetor cleaner, pliers.

3. Clean the Mass Air Flow (MAF) Sensor

• Sub-steps:
  1. Locate the MAF sensor, typically found in the air intake duct.
  2. Remove the electrical connector and unscrew the sensor from the duct.
  3. Use MAF sensor cleaner to spray the sensing element without touching it.
  4. Allow the sensor to dry completely before reinstallation.
• Tools Required: Screwdriver, MAF sensor cleaner.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the test port on the fuel rail.
  2. Turn the ignition to the "ON" position (without starting) and check the pressure.
  3. If the pressure is low, inspect the fuel pump and fuel filter for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Use a fuel injector cleaning kit or ultrasonic cleaner to clean the injectors.
  3. Reinstall the injectors with new O-rings.
• Tools Required: Fuel injector cleaning kit, O-rings.