how to fix P0174 system too lean in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, socket set, screwdriver set, multimeter, cleaning supplies (e.g., MAF cleaner).
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before opening any components.

2. Inspect and Repair Intake System

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Inspect the duct for cracks or loose fittings; replace if necessary.
  3. Check the air filter and replace if dirty or clogged.
  4. Reattach the duct securely and ensure all clamps are tight.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake pathway.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor using a socket set.
  4. Clean the MAF sensor using MAF cleaner and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the ON position (do not start the engine) and check the pressure reading.
  4. Compare the reading with the manufacturer’s specifications; replace the fuel pump if pressure is low.

5. Inspect and Repair Fuel Injectors

• Sub-steps:
  1. Locate the fuel injectors on the engine.
  2. Visually inspect the injectors for leaks or damage.
  3. Use a multimeter to test the resistance of each injector; replace any faulty injectors.
  4. Reinstall any removed components and check for proper connections.