how to fix P0171 code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Raise the vehicle if necessary and secure it on jack stands.

2. Inspect and Clean MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver, torx bit set.
• Locate the MAF sensor in the air intake duct.
• Remove the MAF sensor by unscrewing the retaining screws.
• Spray the MAF sensor with MAF sensor cleaner and allow it to dry completely.
• Reinstall the MAF sensor securely.

3. Check for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional).
• Use a vacuum gauge to check for proper vacuum readings.
• Inspect all vacuum hoses and connections for cracks or disconnections.
• If available, use a smoke machine to identify any hidden leaks.
• Replace any damaged hoses or connections as needed.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge, fuel line wrench.
• Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine).
• Check the fuel pressure reading; it should meet manufacturer specifications (usually around 40-60 psi for most vehicles).
• If the pressure is low, check for a clogged fuel filter or failing fuel pump.
• Replace the fuel filter if necessary and/or test the fuel pump.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit (if needed) or replacement injectors.
• Remove the fuel injectors from the fuel rail carefully.
• Inspect for any signs of clogging or leaks.
• If necessary, clean them using an injector cleaning kit or replace them with new ones.

6. Reassemble and Reset

• Reinstall all components in reverse order of disassembly.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and allow it to reach operating temperature.