how to fix the P0171 code on my Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool completely before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, hose clamps
• Sub-steps:
  1. Remove the air intake duct by loosening the clamps and disconnecting it from the throttle body.
  2. Inspect the duct for cracks or damage and replace it if necessary.
  3. Reattach the duct securely and ensure all clamps are tightened.

3. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine and check the pressure reading against specifications (typically 40-50 psi for Honda).
  3. If the pressure is low, check the fuel pump and filter, replacing them if needed.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdrivers
• Sub-steps:
  1. Disconnect the MAF sensor wiring harness.
  2. Remove the MAF sensor from the air intake assembly.
  3. Spray MAF cleaner onto the sensor elements and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the wiring harness.

5. Inspect Vacuum Hoses

• Tools Required: Visual inspection, hose clamp tool
• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or wear.
  2. Replace any damaged hoses and ensure all connections are secure.

6. Check Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter (for testing)
• Sub-steps:
  1. If the injectors are suspected to be clogged, use a fuel injector cleaner to clean them.
  2. If testing is necessary, disconnect the injectors and use a multimeter to check for proper resistance values according to the service manual specifications.