how to fix P0171 code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake ducting and connections for cracks or loose fittings.
  2. Replace any damaged hoses or components found during inspection.
  3. Ensure that the air filter is clean and free of debris; replace if necessary.

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector and unscrew the sensor from the housing.
  3. Use MAF sensor cleaner to spray the sensing elements, avoiding any physical contact.
  4. Allow the sensor to dry completely before reinstallation.

4. Check and Adjust Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
  3. Compare the reading with manufacturer specifications. Replace the fuel pump or filter if pressure is low.
  4. Inspect the fuel injectors for proper operation; clean or replace as necessary.

5. Final Assembly

• Sub-steps:
  1. Reinstall all components removed during inspection and repair.
  2. Reconnect the battery.
  3. Start the engine and allow it to reach operating temperature.