how to fix the code P0171 in my Toyota Camry XV40 (2007-2011)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, screwdrivers, cleaning solvent.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks or disconnections.
  2. Replace any damaged hoses or gaskets identified during the inspection.
  3. Reconnect all components securely.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor using the appropriate socket.
  4. Clean the sensor using MAF cleaner spray; do not touch the sensor element.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel System Inspection

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure.
  3. If the pressure is below specification, check the fuel pump and filter for clogs or failures.
  4. Replace the fuel filter if necessary and check the fuel pump operation.

5. Vacuum Leak Repair

• Sub-steps:
  1. Inspect vacuum hoses for wear or damage.
  2. Replace any faulty hoses.
  3. Check the intake manifold for leaks, and reseal as necessary.