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

Solution

1. Preparation

• Ensure the vehicle is on a level surface and the engine is turned off.
• Disconnect the negative terminal of the battery to avoid electrical hazards.
• Gather tools and parts required for the repair.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Remove the engine cover if applicable.
• Inspect the air filter; replace it if dirty or clogged.
• Check all intake hoses for cracks or loose connections; replace any damaged hoses.
• Tighten clamps as necessary to ensure a proper seal.

3. Test and Clean MAF Sensor

• Tools Required: MAF cleaner, torque wrench
• Locate the MAF sensor, typically between the air filter and throttle body.
• Disconnect the electrical connector from the MAF sensor.
• Remove the sensor using a socket set.
• Clean the sensor using MAF cleaner; avoid touching the sensor elements.
• Reinstall the sensor and torque to manufacturer specifications.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position without starting the engine and check the pressure reading.
• Compare the reading to manufacturer specifications; if low, inspect the fuel pump and filter for issues.
• If the fuel pump is faulty, replace it according to the manufacturer's instructions.

5. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench
• Locate the upstream oxygen sensor on the exhaust manifold.
• Disconnect the electrical connector and remove the sensor using an O2 sensor socket.
• Install the new oxygen sensor and torque to manufacturer specifications.
• Reconnect the electrical connector.