how to fix P0171 code in my Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

Tools Required:

• OBD-II scanner
• Vacuum gauge
• Fuel pressure gauge
• Multimeter
• Torque wrench
• Basic hand tools (sockets, wrenches, screwdrivers)

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Start with a visual inspection of all vacuum hoses for cracks or disconnections.
  2. Use a vacuum gauge to test the intake manifold for any leaks.
  3. If a leak is found, replace the faulty hose or gasket.

3. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the pressure reading; it should be within manufacturer specifications (typically between 40-50 psi).
  3. If pressure is low, inspect the fuel pump, filter, and lines for issues and replace as necessary.

4. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the intake duct.
  3. Spray MAF cleaner on the sensing element and allow it to dry before reinstalling.
  4. If damaged, replace the MAF sensor with a new one.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel injector connectors.
  2. Use a multimeter to check the resistance of each injector; compare with specifications.
  3. If any injector is faulty, remove it and replace it with a new one.

6. Reassemble and Test

• Reconnect all components and ensure all connections are secure.
• Reconnect the negative battery terminal.