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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent any electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, flashlight
• Sub-steps:
  1. Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
  2. Tighten any loose clamps on the air intake hoses.
  3. Replace any damaged hoses or connections as necessary.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner (or electrical cleaner), socket set
• Sub-steps:
  1. Locate the MAF sensor, usually found in the air intake duct.
  2. Disconnect the electrical connector and remove the MAF sensor from its housing.
  3. Spray the MAF sensor with the cleaner and allow it to dry completely before reinstalling.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition key to the "ON" position (do not start the engine) to pressurize the fuel system.
  4. Check the pressure reading against manufacturer specifications; if low, inspect the fuel pump and fuel filter.

5. Inspect and Replace Fuel Injectors (if necessary)

• Tools Required: Socket set, fuel injector removal tool
• Sub-steps:
  1. Disconnect the battery.
  2. Remove the intake manifold to access the fuel injectors.
  3. Inspect the injectors for clogs or leaks; replace if necessary.
  4. Reassemble the intake manifold and reconnect the battery.