how to fix P0171 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Inspect Air Intake System

• Tools Required: Vacuum gauge, socket set.
• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a vacuum gauge to check for leaks in the intake manifold.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean MAF Sensor

• Tools Required: MAF cleaner, screwdriver.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and the intake duct.
  3. Spray MAF cleaner onto the sensor element, avoiding contact with the wiring.
  4. Allow the sensor to dry completely before reinstallation.

4. Check Fuel Delivery System

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  1. Access the fuel rail and attach the fuel pressure gauge.
  2. Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading.
  3. Compare the reading with manufacturer specifications (typically around 40-50 psi).
  4. If pressure is low, inspect the fuel pump and filter; replace if necessary.

5. Replace Faulty Components

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. If any faulty components (fuel injectors, fuel pump, or MAF sensor) were identified, proceed to replace them.
  2. Follow the manufacturer’s torque specifications when reassembling components.
  3. Reconnect battery after all repairs are complete.