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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the vehicle's battery to prevent any electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Air Intake Components

• Sub-steps:
  1. Remove the air intake duct by loosening the clamps and disconnecting the MAF sensor wiring harness.
  2. Visually inspect for cracks in the duct and replace if damaged.
  3. Check the air filter and replace it if it is dirty or clogged.
  4. Reinstall the air intake duct and reconnect the MAF sensor.

3. Check and Replace Fuel Filter (if necessary)

• Sub-steps:
  1. Locate the fuel filter according to the vehicle's service manual.
  2. Relieve the fuel pressure by removing the fuel pump relay and starting the engine until it stalls.
  3. Disconnect the fuel lines, ensuring to catch any spilled fuel.
  4. Replace the fuel filter with a new one and reconnect the fuel lines securely.
  5. Reinstall the fuel pump relay and turn the key to the ON position to prime the fuel system before starting the engine.

4. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake assembly.
  2. Clean the MAF sensor using MAF cleaner spray and a soft brush. Allow it to dry completely.
  3. If damaged, replace the MAF sensor with a new one.
  4. Reinstall the MAF sensor and reattach the wiring harness.

5. Inspect and Replace Oxygen Sensor (if necessary)

• Sub-steps:
  1. Locate and disconnect the upstream oxygen sensor.
  2. Use an oxygen sensor socket to remove the old sensor.
  3. Install the new oxygen sensor and connect the wiring harness.
  4. Ensure all electrical connections are secure.