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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shocks.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver, flashlight.
• Remove the air intake duct from the throttle body.
• Inspect the duct for cracks or loose connections; replace if necessary.
• Check the intake manifold gasket for signs of wear or leaks; replace if damaged.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner.
• Carefully disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake assembly.
• Spray the sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and connect the fuel pressure gauge to the test port.
• Turn the ignition key to the "ON" position without starting the engine to check pressure.
• Compare the reading with the manufacturer's specification (usually around 40-50 psi).
• If pressure is low, inspect the fuel pump and filter; replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaning kit (if necessary).
• Disconnect the electrical connectors from the fuel injectors.
• Use a multimeter to check the resistance of each injector; replace any that are out of specification.
• If injectors are clogged, use an injector cleaning kit or replace them.

6. Final Assembly

• Reconnect all components and ensure there are no loose connections.
• Reconnect the negative battery terminal.
• Start the engine and let it idle, checking for any leaks or abnormalities.