how to diagnose and fix P0171 code in Honda Accord Eleventh Generation (2023-present)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts during repairs.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Visually inspect hoses and connections for cracks or disconnections.
• Use a vacuum gauge to check for leaks; repair or replace any faulty components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake.
• Clean the MAF sensor with the appropriate cleaner and let it dry.
• Reinstall the sensor and reconnect the connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition on (do not start) and check fuel pressure; it should match manufacturer specifications.
• If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or ultrasonic cleaner
• Remove the fuel injectors from the engine.
• Clean the injectors using the cleaning kit or ultrasonic cleaner.
• Reinstall the injectors ensuring proper sealing and connection.

6. Test Oxygen Sensors

• Tools Required: Multimeter
• Disconnect the upstream and downstream oxygen sensors.
• Use a multimeter to check the voltage output; compare readings to manufacturer specifications.
• Replace any sensors that are out of specification.