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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather tools and parts.
• Disconnect the battery before beginning work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers.
• Use a vacuum gauge to test for leaks. If the gauge shows a low reading, inspect all hoses and connections for cracks or disconnections.
• Replace any damaged hoses or gaskets.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail. Start the engine and check the pressure against manufacturer specifications (typically around 40-50 psi for the Honda Pilot).
• If pressure is low, replace the fuel pump or fuel filter if clogged.

4. MAF Sensor Cleaning/Replacement

• Tools Required: MAF sensor cleaner, screwdriver.
• Disconnect the MAF sensor wiring harness and remove the sensor from the intake tube.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely. If damaged, replace with a new sensor.

5. Fuel Injector Inspection

• Tools Required: Multimeter, injector cleaning kit.
• Test each injector's resistance with a multimeter. Replace any that are out of specification.
• If clogged, use an injector cleaning kit to clean or replace the injectors as needed.

6. Reassemble and Check

• Reconnect all components and ensure all connections are secure.
• Reconnect the battery and clear the error codes using the OBD-II scanner.