how to resolve P0171 code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool if it has been running.

2. Inspect and Fix Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, torque wrench.
• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the air intake system.
  2. Inspect all hoses and connections for cracks or disconnections.
  3. Replace any damaged hoses or clamps.
  4. Reassemble any disconnected parts and tighten to manufacturer specifications.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the sensor from the intake tube.
  3. Spray MAF sensor cleaner onto the sensor to remove contaminants.
  4. Allow the sensor to dry and reinstall it carefully.
  5. Reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect the fuel pressure gauge at the fuel rail test port.
  2. Start the engine and observe the pressure reading. It should match manufacturer specifications (typically between 40-50 psi).
  3. If low, check fuel pump and filter for issues, replacing if necessary.

5. Inspect Oxygen Sensor

• Tools Required: O2 sensor socket, multimeter.
• Sub-steps:
  1. Disconnect the oxygen sensor electrical connector.
  2. Use an O2 sensor socket to remove the sensor from the exhaust system.
  3. Test the sensor’s resistance with a multimeter; compare the reading to specifications.
  4. Replace the sensor if it is out of range or damaged.