how to fix P0171 code in Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check for any cracks or loose connections in the air intake hoses.
• Tighten or replace any loose or damaged hoses.
• If air leaks are found, replace the affected components.

3. Test and Adjust 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. It should match the specifications in the service manual.
• If pressure is low, check the fuel filter and fuel pump for clogs or failures. Replace them as necessary.

4. Service the MAF Sensor

• Tools Required: MAF sensor cleaner
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and remove the sensor.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.
• Reconnect the sensor and electrical connector.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket
• Locate the upstream oxygen sensor (pre-catalytic converter).
• Disconnect the sensor and use an O2 sensor socket to remove it.
• Inspect the sensor for any signs of damage or contamination.
• Replace with a new oxygen sensor if necessary.

6. Check Engine Coolant Temperature Sensor

• Tools Required: Multimeter
• Locate the engine coolant temperature sensor.
• Disconnect the sensor and test its resistance with a multimeter according to the specifications in the service manual.
• Replace the sensor if the readings are out of specification.