what does it mean when my Toyota Camry Eighth Generation (2018-present) displays a P0171 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge, smoke machine (if available)
• Sub-steps:
  1. Visually inspect all air intake hoses for cracks, loose connections, or signs of wear.
  2. If any leaks are found, replace the affected hoses.
  3. Use a smoke machine to identify any hidden vacuum leaks in the intake manifold.

3. Check and Clean the Mass Airflow Sensor

• Tools Required: MAF sensor cleaner, torque wrench
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct (refer to vehicle-specific torque specifications).
  3. Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstallation.

4. Test and Replace Fuel Pressure Regulator (if necessary)

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position without starting the engine and check the fuel pressure reading.
  3. If pressure is below specifications, replace the fuel pump or fuel pressure regulator as necessary.

5. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench set
• Sub-steps:
  1. Locate the upstream oxygen sensor (before the catalytic converter).
  2. Disconnect the electrical connector and remove the sensor using an O2 sensor socket.
  3. Install the new sensor, ensuring proper torque is applied (consult vehicle specifications).