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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Basic hand tools, vacuum gauge.
• Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
• Use a vacuum gauge to measure the intake vacuum; a low reading indicates a leak.
• Replace any damaged hoses and reseal the intake manifold.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and unscrew the sensor from the duct.
• Clean the sensor with MAF cleaner (do not touch the sensor element).
• If the sensor is damaged, replace it with a new one and reconnect.

4. Test and Replace Fuel Filter (if necessary)

• Tools Required: Fuel line disconnect tool, basic hand tools.
• Locate the fuel filter and relieve any fuel pressure in the system.
• Disconnect the fuel lines and remove the old filter.
• Install the new filter, ensuring correct orientation and tight connections.

5. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
• Compare the reading with manufacturer specifications. If low, inspect the fuel pump and relay.

6. Clear Codes and Test Drive

• Reconnect the battery and use the OBD-II scanner to clear the P0171 code.
• Start the engine and take the vehicle for a test drive to ensure the code does not reappear.