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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, multimeter, MAF sensor cleaner, vacuum gauge.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Inspect Air Intake System

• Remove the engine cover if applicable.
• Inspect the air intake duct for cracks or loose fittings.
• Tighten any loose clamps and replace damaged hoses or ducts.
• Use a vacuum gauge to check for vacuum leaks at the intake manifold and vacuum hoses.

3. Check and Clean MAF Sensor

• Locate the MAF sensor in the air intake system.
• Disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor using a socket set.
• Clean the sensor with MAF sensor cleaner, allowing it to dry completely before reinstallation.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail's test port.
• Turn the ignition to the "ON" position but do not start the engine; check the fuel pressure reading.
• Compare the reading against manufacturer specifications (usually around 40-50 psi for Honda).
• If low, check the fuel pump and fuel filter for proper operation.

5. Inspect and Test Fuel Injectors

• Remove the fuel rail to access the fuel injectors.
• Visually inspect the injectors for cracks or leaks.
• Use a multimeter to check the resistance of each injector (typically 12-16 ohms).
• Clean or replace any faulty injectors as needed.

6. Reassemble and Reset System

• Reassemble any components removed during the repair.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and allow it to reach operating temperature.