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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical issues.
• Allow the engine to cool 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 to detect hidden leaks if necessary.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor; it is typically found between the air filter and throttle body.
  2. Remove the MAF sensor connector.
  3. Use MAF sensor cleaner to clean the sensor element. Do not touch the sensor with fingers.
  4. Reinstall the sensor and connector, ensuring a secure fit.

4. Test 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.
  3. If pressure is below specifications, check the fuel pump and filter. Replace as necessary.

5. Check and Replace Oxygen Sensors

• Sub-steps:
  1. Inspect the wiring and connectors of the upstream oxygen sensor.
  2. Use a multimeter to test the sensor’s output if the wiring appears intact.
  3. If faulty, remove the oxygen sensor using an O2 sensor socket and replace it with a new one.