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

Solution

1. Preparation

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

2. Inspect and Repair Air Leaks

• Tools Required: Socket set, screwdrivers
• Instructions:
  1. Visually inspect all intake hoses and connections for cracks, wear, or loose fittings.
  2. Tighten any loose clamps and replace damaged hoses as necessary.
  3. If using a smoke machine, introduce smoke into the intake system to identify leaks.

3. Clean the MAF Sensor

• Tools Required: MAF cleaner, soft cloth
• Instructions:
  1. Locate the MAF sensor, usually situated between the air filter and the throttle body.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the sensor from the intake duct using a socket.
  4. Spray MAF cleaner onto the sensor elements and allow it to dry completely before reinstallation.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading with the manufacturer's specifications (typically around 50-60 psi).
  4. If pressure is low, inspect the fuel pump and filter for issues. Replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Multimeter or injector tester
• Instructions:
  1. Disconnect the fuel injector connectors.
  2. Use a multimeter to check the resistance of each injector; it should typically be around 12-16 ohms.
  3. If any injector is out of spec, replace it with a new one.