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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver, vacuum gauge
• Check for cracks or disconnections in the air intake duct and hoses.
• If leaks are found, replace damaged hoses or ducting.
• Reattach any disconnected hoses securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Remove the MAF sensor from the air intake.
• Spray the sensor with MAF cleaner and let it dry completely.
• Reinstall the MAF sensor ensuring it is secured properly.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start the engine) and check the fuel pressure reading against the specifications (generally around 40-50 psi for most Honda models).
• If pressure is low, check the fuel pump and fuel filter for issues; replace as necessary.

5. Replace Faulty Oxygen Sensor (If Required)

• Tools Required: O2 sensor socket, wrench
• Locate the upstream O2 sensor (before the catalytic converter).
• Disconnect the wiring harness and remove the sensor using the O2 sensor socket.
• Install the new O2 sensor and reconnect the wiring harness.

6. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the error codes and run the engine to check for any recurrence of the P0171 code.