how to fix Honda Accord 10th Generation (2018-2022) P0171 lean code

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Remove the engine cover if applicable.
• Inspect all intake hoses for cracks or leaks and replace any damaged hoses.
• Check the air filter for cleanliness; replace if dirty.
• Ensure the intake manifold is properly sealed; replace gaskets if necessary.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner.
• Locate the MAF sensor in the intake system.
• Disconnect the electrical connector and remove the sensor from the housing.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.
• Reattach the MAF sensor and connector securely.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge to the test port.
• Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading.
• If the pressure is below the manufacturer's specification, consider replacing the fuel pump or fuel filter.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, multimeter (for testing).
• Remove the fuel rail to access the injectors.
• Inspect for any signs of clogging or damage and clean them using an injector cleaning solution.
• Test each injector for resistance using a multimeter; replace any that are outside the specified range.

6. Reassemble and Test

• Reinstall all components, ensuring all connections are secure.
• Reconnect the negative battery terminal.
• Start the engine and monitor for any abnormal sounds or leaks.