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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

1. Visual Inspection: Check all vacuum hoses and connections for cracks or disconnections.
2. Seal Leaks: Replace any damaged hoses or gaskets found during inspection.
3. MAF Sensor Cleaning:
   • Remove the MAF sensor from the air intake duct.
   • Use MAF sensor cleaner to carefully clean the sensor elements.
   • Allow it to dry completely before reinstalling.

3. Check and Repair Fuel Delivery System

1. Fuel Pressure Test:
   • Connect a fuel pressure gauge to the fuel rail.
   • Turn the ignition to the 'ON' position without starting the engine and check the pressure.
   • Compare with the manufacturer's specifications (typically between 40-50 psi).
2. Inspect Fuel Injectors:
   • Remove the fuel injectors from the rail.
   • Check for clogs or leaks and clean or replace as necessary.
3. Reassemble: Reinstall the injectors and reconnect the fuel rail.

4. Verify Exhaust System

1. Inspect for Leaks: Check the exhaust system from the engine to the catalytic converter for any leaks using a smoke test or visual inspection.
2. Repair Any Leaks: Use exhaust tape or replace damaged components as needed.

5. Clear Codes and Test

1. Reconnect Battery: Restore power by reconnecting the negative battery terminal.
2. Clear Codes: Use an OBD-II scanner to clear the P0171 code.
3. Test Drive: Take the vehicle for a test drive to monitor performance and check for the reappearance of the code.