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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Check all vacuum hoses and the intake manifold for leaks.
  • Sub-steps:
    1. Visually inspect all hoses and connections for cracks or disconnections.
    2. Use a smoke machine or carburetor cleaner to identify leaks by spraying around suspected areas while the engine is running.
    3. Replace any damaged hoses or re-secure loose connections.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner, Torx or Phillips screwdriver
• Remove and clean the MAF sensor.
  • Sub-steps:
    1. Locate the MAF sensor on the air intake duct.
    2. Disconnect the electrical connector and remove the sensor.
    3. Spray MAF cleaner on the sensor element and allow it to dry completely.
    4. Reinstall the MAF sensor and secure the connector.

4. Test Fuel System Pressure

• Tools Required: Fuel pressure gauge
• Ensure the fuel system is delivering adequate pressure.
  • Sub-steps:
    1. Locate the fuel pressure test port on the fuel rail.
    2. Attach the fuel pressure gauge and turn the ignition to the "ON" position (do not start the engine).
    3. Check the pressure reading against manufacturer specifications; it should typically be between 40-50 psi.
    4. If pressure is low, check fuel pump operation, filter condition, and relay functionality.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, multimeter
• Check for clogged or malfunctioning injectors.
  • Sub-steps:
    1. Remove the fuel injectors from the rail.
    2. Clean the injectors using an ultrasonic cleaner or injector cleaning kit.
    3. Test each injector for proper resistance using a multimeter; it should typically be around 12-16 ohms.
    4. Replace any faulty injectors.