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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Torque wrench
• Socket set
• Multimeter
• Cleaning solvent
• Screwdrivers

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the intake manifold, vacuum hoses, and throttle body for cracks or disconnections.
  2. Repair or replace any damaged components found during the inspection.
  3. If any leaks are detected, use appropriate sealant or replacement parts.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor wiring harness.
  2. Remove the MAF sensor from the intake tube using a socket set.
  3. Spray the MAF sensor with a specialized cleaner and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the wiring harness.

4. Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Start the engine and monitor the fuel pressure; it should be within the manufacturer's specified range.
  3. If pressure is low, check and replace the fuel filter if clogged, and inspect the fuel pump for proper operation.

5. Inspect O2 Sensor

• Sub-steps:
  1. Locate the upstream oxygen sensor on the exhaust manifold.
  2. Use a multimeter to test the O2 sensor for proper voltage output while the engine is running.
  3. If the O2 sensor is faulty, replace it with a new one according to manufacturer specifications.