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

Solution

1. Preparation

• Gather tools and parts for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Inspect the air intake duct and hoses for cracks or disconnections.
  3. Tighten or replace any loose or damaged clamps and hoses.
  4. Check for any obstructions in the air filter and replace if necessary.

3. Test and Clean MAF Sensor

• Tools Required: MAF cleaner or electrical contact cleaner.
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct.
  3. Spray MAF cleaner onto the sensor element, avoiding contact with the wiring.
  4. Allow it to dry completely before reinstalling the sensor.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine to check for initial pressure.
  3. Start the engine and observe the fuel pressure; it should be within specified range (consult service manual).
  4. If pressure is low, inspect the fuel pump and fuel filter for issues and replace as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or ultrasonic cleaner.
• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Disconnect the electrical connectors from each injector.
  3. Clean the injectors using an injector cleaning kit or replace them if damaged.
  4. Reinstall the fuel rail with a new gasket/seal if necessary.

6. Reassemble and Reconnect

• Reinstall any components removed during the inspection and repair processes in reverse order.
• Reconnect the negative battery terminal.