how to fix P0171 code in Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal from the battery to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and a flashlight.
• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the intake system.
  2. Visually inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses and reattach loose connections.

3. Fuel System Inspection

• 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 to check the fuel pressure.
  3. Compare the reading with the manufacturer’s specifications (typically around 50-60 psi).
  4. If the pressure is low, inspect the fuel pump and filter; replace if necessary.

4. MAF Sensor Cleaning/Replacement

• Tools Required: Cleaning spray specifically for MAF sensors.
• Sub-steps:
  1. Locate the MAF sensor in the intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray the cleaning solution on the sensor element and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

5. Fuel Injector Inspection

• Tools Required: Fuel injector cleaning kit (if necessary).
• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect each injector for signs of clogging or leakage.
  3. If clogged, clean the injectors using a fuel injector cleaning kit or replace them if necessary.