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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery cable to avoid electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to test intake manifold vacuum; a reading below specifications indicates a leak.
• Repair or replace damaged hoses as needed.

3. Check and Clean the MAF Sensor

• Tools Required: MAF cleaner, soft brush
• Locate the MAF sensor on the intake air duct.
• Carefully disconnect the MAF sensor's electrical connector.
• Remove the MAF sensor from the duct and clean it with MAF cleaner.
• Reinstall the sensor and connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition key to the "On" position (do not start the engine) to check the pressure.
• Ensure the pressure is within manufacturer specifications (usually 30-50 psi).
• If pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Tools Required: Multimeter
• Disconnect the electrical connectors from the fuel injectors.
• Use a multimeter to check the resistance of each injector; compare readings to specifications.
• Clean or replace any clogged or faulty injectors.

6. Final Assembly

• Reassemble any components removed during the inspection.
• Reconnect the negative battery cable.
• Start the engine and allow it to run for a few minutes to check for leaks and proper operation.