how to fix P0171 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent accidental electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers, and a flashlight.
• Inspect all vacuum lines and intake gaskets for cracks or disconnections.
• If any leaks are found, replace the damaged hoses or gaskets and secure them with hose clamps.
• Reconnect the battery and clear the P0171 code with the OBD-II scanner.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner and a screwdriver.
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake duct using the screwdriver.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Replace Fuel Pump/Fuel Filter (if needed)

• Tools Required: Fuel pressure gauge and a wrench.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "ON" position without starting the engine to check the fuel pressure reading.
• If the pressure is below specifications, consider replacing the fuel pump or fuel filter.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit and a multimeter.
• Disconnect the fuel injectors from the harness.
• Use the cleaning kit to clean the fuel injectors according to the manufacturer's instructions.
• Check the injector resistance with a multimeter; replace any injectors that are out of specification.