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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps and replace damaged hoses.
  3. If applicable, inspect the intake manifold gasket for leaks and replace it if necessary.
• Tools Required: Socket set, screwdrivers, torque wrench.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the sensor from the housing.
  3. Clean the sensor using MAF cleaner spray; avoid using other cleaners that may damage the sensor.
  4. Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: Torx or socket wrench, MAF sensor cleaner.

4. Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition on (do not start) and check the fuel pressure reading; it should be within manufacturer specifications.
  3. If the pressure is low, check the fuel pump and filter; replace as necessary.
• Tools Required: Fuel pressure gauge.

5. Inspect and Replace Oxygen Sensors (if needed)

• Sub-steps:
  1. Locate the upstream oxygen sensor (usually on the exhaust manifold).
  2. Disconnect the electrical connector and use an oxygen sensor socket to remove the sensor.
  3. Install the new oxygen sensor and reconnect the electrical connector.
• Tools Required: Oxygen sensor socket, torque wrench.