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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety during repairs.

2. Inspect for Vacuum Leaks

• Use a smoke machine or propane torch (without ignition) to identify leaks.
• Visually inspect all hoses and the intake manifold for cracks or disconnections.
• Tighten any loose connections or replace damaged hoses as necessary.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor in the intake tract.
• Disconnect the electrical connector and remove the MAF sensor using a Torx screwdriver.
• Clean the MAF sensor using MAF cleaner spray, avoiding touching the sensor elements.
• If the sensor is damaged, replace it with a new one.

4. Check Fuel System

• Use a fuel pressure gauge to check fuel pressure at the fuel rail. Compare with manufacturer specifications (typically around 30-40 psi).
• If pressure is low, inspect the fuel pump and filter for blockages or wear.
• Replace the fuel filter if it has not been changed in accordance with the maintenance schedule.

5. Inspect Oxygen Sensors

• Locate the upstream oxygen sensor (before the catalytic converter).
• Check the wiring and connector for damage.
• If necessary, test the sensor with a multimeter to ensure it is functioning within specifications.
• Replace the oxygen sensor if it is faulty.

6. Reassemble and Reconnect Battery

• Reinstall any components removed during inspection and repairs.
• Reconnect the battery terminals, ensuring a secure connection.