how to fix P0171 code on my Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
  • Inspect all hoses and connections in the air intake system for cracks or loose fittings.
  • Use a vacuum gauge to check for leaks in the intake manifold.
  • Replace any damaged hoses or gaskets as needed.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
  • Locate the MAF sensor and disconnect its electrical connector.
  • Remove the MAF sensor from the air intake duct.
  • Spray MAF sensor cleaner onto the sensor element and allow it to air dry.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Start the engine and observe the fuel pressure reading; it should match the specifications outlined in the service manual.
  • If the pressure is low, inspect the fuel pump, filter, and relays for issues. Replace components as necessary.

5. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench
  • Locate the upstream oxygen sensor and disconnect its electrical connector.
  • Use an O2 sensor socket to remove the sensor from the exhaust manifold.
  • Install the new oxygen sensor, applying anti-seize compound to the threads if specified.
  • Reconnect the electrical connector.