how to fix P0171 code in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• 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 lines connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify leaks around the intake manifold and hoses.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor on the air intake duct.
  2. Disconnect the electrical connector and unscrew the sensor from the duct.
  3. Clean the MAF sensor with MAF cleaner spray; do not touch the sensor elements directly.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position without starting the engine and record the fuel pressure.
  3. If the pressure is below specifications, inspect the fuel pump and replace if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel injector connectors and inspect for corrosion or damage.
  2. If necessary, clean the injectors using a dedicated fuel injector cleaner or replace with new ones.
  3. Reconnect fuel injector connectors and ensure tight connections.