how to fix P0171 code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a smoke machine to identify leaks if necessary.
  • Replace any damaged hoses with OEM parts.

3. Check and Clean the MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the intake duct (usually requires a Torx screwdriver).
  • Clean the MAF sensor using MAF cleaner spray and a soft brush; avoid touching the sensor elements.
  • Reinstall the MAF sensor and secure it tightly.

4. Test Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition to the ON position (do not start) and check pressure reading.
  • If the pressure is below specifications, replace the fuel filter or fuel pump as necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the engine cover and access the fuel injectors.
  • Use an injector cleaning kit to clean the injectors or replace them if they are faulty.

6. Clear Error Codes

• Sub-steps:
  • Reconnect the battery terminal.
  • Use the OBD-II scanner to clear the P0171 code.