how to fix P0171 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Raise the vehicle if needed and secure it on jack stands.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner while the engine is running to identify any leaks.
  3. Replace any damaged hoses or seals found during inspection.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the MAF sensor using MAF cleaner spray. Do not touch the sensor with your fingers.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Repair Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Start the engine and observe the fuel pressure reading. Compare it to manufacturer specifications.
  3. If pressure is low, check the fuel pump and filter for issues. Replace as necessary.
  4. Inspect the fuel injectors for clogs; clean or replace them as needed.

5. Inspect for Exhaust Leaks

• Sub-steps:
  1. Start the engine and listen for any unusual noises that may indicate exhaust leaks.
  2. Use a smoke test or visual inspection to locate leaks in the exhaust system.
  3. Repair any leaks found, replacing gaskets or sections of piping as necessary.