how to address the P0171 code on my Honda Pilot Third Generation (2016-present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver.
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to identify leaks; if pressure is low, replace any damaged hoses.
• Reconnect all hoses securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver, cloth.
• Remove the MAF sensor from the air intake duct (usually requires a Torx or Phillips screwdriver).
• Clean the sensor using MAF cleaner; do not touch the sensor element.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge, adapter kit.
• Locate the fuel rail and attach the fuel pressure gauge to the test port.
• Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading; it should be within the manufacturer’s specified range (typically around 30-50 psi).
• If the pressure is low, check the fuel pump relay and fuse, and consider replacing the fuel pump if necessary.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit, multimeter (for electrical testing).
• Remove the fuel injectors from the engine (may require removing the intake manifold).
• Inspect for clogs or leaks; use a cleaning kit to flush out any deposits.
• Test the electrical connections of the injectors with a multimeter to ensure they are functioning properly.

6. Reassemble and Reconnect

• Reinstall all components in reverse order of removal.
• Reconnect the negative battery terminal and start the engine to ensure proper operation.