my Toyota Tacoma N300 (2016-Present) has a check engine light with code P0171, what does this mean?

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Steps:
  1. Start the engine and use a vacuum gauge to check for any abnormal readings that may indicate a leak.
  2. Visually inspect all vacuum hoses and gaskets for cracks, tears, or disconnections.
  3. Replace any damaged hoses or gaskets with OEM parts.

3. Check and Replace Fuel Pressure

• Tools Required: Fuel pressure gauge, line wrenches
• Steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Start the engine and observe the gauge reading; it should be within the manufacturer’s specified range (typically around 50-60 psi for Tacoma).
  3. If the pressure is low, check the fuel pump and filter for blockages and replace them if necessary.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the MAF sensor from its housing.
  3. Spray MAF sensor cleaner on the sensor element to remove dirt and debris.
  4. Allow it to dry completely and reinstall the sensor.

5. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner, soft cloth
• Steps:
  1. Remove the air intake duct from the throttle body.
  2. Spray throttle body cleaner onto the throttle plate and inside the throttle body.
  3. Use a soft cloth to wipe away carbon buildup.
  4. Reassemble the components and reconnect the air intake duct.