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 flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Use a vacuum gauge to check for leaks in the intake manifold and hoses.
• Replace any damaged hoses, gaskets, or clamps.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray the sensor with MAF cleaner and let it dry.
• Reinstall the sensor securely.

4. Test and Repair Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail's test port.
• Start the engine and check the fuel pressure; it should match the specifications (usually around 40-50 psi).
• If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter
• Remove the fuel injectors and check for clogs using fuel injector cleaner.
• Test each injector with a multimeter to ensure proper resistance and operation.
• Replace any faulty injectors.

6. Check Engine Coolant Temperature Sensor

• Tools Required: Multimeter
• Locate the coolant temperature sensor and disconnect the wiring harness.
• Use a multimeter to check resistance and compare it with the manufacturer specifications.
• Replace the sensor if it is out of spec.