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 down before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or propane torch to detect leaks if necessary.
  3. Replace any damaged hoses with OEM parts and secure connections.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position without starting the engine to check the initial pressure.
  3. Compare the reading to the manufacturer specifications (typically around 40-50 psi for most Honda models).
  4. If pressure is low, inspect the fuel pump and fuel filter, replacing them as needed.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol
• Sub-steps:
  1. Disconnect the MAF sensor connector and remove the sensor from the air intake.
  2. Clean the sensor elements gently with MAF cleaner.
  3. Allow the sensor to dry completely and reinstall it.

5. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner
• Sub-steps:
  1. Remove the air intake duct from the throttle body.
  2. Spray throttle body cleaner inside and use a soft cloth to wipe away carbon buildup.
  3. Reattach the intake duct securely.