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

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the air intake duct and inspect for cracks or loose connections.
  2. Replace any damaged hoses or clamps.
  3. Reinstall the air intake duct securely.

3. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position without starting the engine and check the fuel pressure reading (should be within specified range, typically 40-50 psi).
  3. If pressure is low, inspect the fuel pump and filter for issues and replace if necessary.

4. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake assembly.
  3. Clean the MAF sensor with MAF cleaner spray; allow it to dry before reinstalling.
  4. If damaged, replace the MAF sensor with a new component.

5. Inspect and Repair Vacuum Lines

• Sub-steps:
  1. Visually inspect all vacuum lines for cracks or wear, focusing on those connected to the intake manifold.
  2. Replace any damaged vacuum lines found during inspection.

6. Test Oxygen Sensor

• Sub-steps:
  1. Locate the upstream oxygen sensor (pre-catalytic converter).
  2. Use a multimeter to check the sensor's voltage output while the engine is running (should fluctuate between 0.1V and 0.9V).
  3. Replace if the readings are outside the specified range.