why is my Honda Accord 10th Generation (2018-2022) check engine light on with code P0171?

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 terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Screwdriver set, inspection mirror, flashlight
• Use the inspection mirror and flashlight to visually inspect hoses and gaskets for cracks or damage.
• If any leaks are found, replace the damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Locate the MAF sensor on the air intake duct.
• Disconnect the electrical connector and remove the sensor from the duct.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.
• Reattach the sensor and electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail on the engine.
• Connect the fuel pressure gauge to the service port on the fuel rail.
• Turn the ignition to the ON position (do not start) and check the pressure reading against manufacturer specifications.
• If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

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

6. Reassemble and Test

• Reconnect the battery terminal.
• Clear the trouble codes using the OBD-II scanner.
• Start the engine and observe for any abnormal noises or issues.