how to fix P0171 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent any electrical shorts while working.
• Allow the engine to cool down before starting.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, socket set.
• Instructions:
  1. Use a vacuum gauge to measure the vacuum in the intake manifold.
  2. Inspect all vacuum hoses for cracks or disconnections and replace them as needed.
  3. Tighten any loose clamps on the intake manifold.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner.
• Instructions:
  1. Locate the MAF sensor, typically found between the air filter and the throttle body.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor from the intake ducting.
  4. Spray MAF sensor cleaner onto the sensor element and allow it to dry.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Instructions:
  1. Locate the fuel rail on the engine.
  2. Connect the fuel pressure gauge to the test port on the fuel rail.
  3. Turn the ignition to the "ON" position without starting the engine and check the pressure reading; it should meet manufacturer specifications.
  4. If pressure is low, inspect or replace the fuel pump and fuel filter.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit.
• Instructions:
  1. Remove the fuel rail assembly from the engine.
  2. Disconnect the fuel injectors from the rail.
  3. Use a fuel injector cleaning kit to clean the injectors per the manufacturer's instructions.
  4. Reinstall the injectors and fuel rail.

6. Reset the Engine Control Module (ECM)

• Tools Required: OBD-II scanner.
• Instructions:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0171 code from the ECM.
  3. Start the engine and monitor for any reoccurrence of the check engine light.