how to fix P0174 code on Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts during repair.

2. Inspect and Repair Air Intake System

• Inspect Hoses: Visually inspect all vacuum lines and the intake manifold for any cracks or disconnections.
• Repair or Replace: Replace any damaged hoses or components found during inspection.
• Reassemble: Ensure all connections are properly seated before moving to the next step.

3. Check and Clean MAF Sensor

• Remove MAF Sensor: Disconnect the electrical connector and carefully remove the MAF sensor from the air intake.
• Clean MAF Sensor: Use MAF sensor cleaner to gently clean the sensor elements. Allow it to dry completely.
• Reinstall: Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Connect Fuel Pressure Gauge: Locate the fuel rail and connect the fuel pressure gauge to the designated test port.
• Start Engine: Turn the ignition to the "ON" position without starting the engine to check pressure; then start the engine and observe the pressure readings.
• Compare to Specifications: Ensure the pressure reading is within manufacturer specifications (typically 30-50 psi). If not, consider replacing the fuel pump or fuel filter.

5. Inspect Fuel Injectors

• Remove Fuel Injector Connectors: Carefully disconnect each fuel injector connector.
• Test Injectors: Use a multimeter to measure resistance across each injector. Resistance should typically be between 12-16 ohms. Replace any injectors that do not meet specifications.
• Reinstall Connectors: Reconnect all fuel injector connectors after inspection.

6. Replace Engine Coolant Temperature Sensor (if needed)

• Locate Sensor: The engine coolant temperature sensor is usually found near the thermostat housing.
• Disconnect Connector: Carefully disconnect the electrical connector from the sensor.
• Remove Sensor: Use a wrench to unscrew the sensor from the engine block.
• Install New Sensor: Apply thread sealant and install the new sensor, ensuring it is securely tightened.
• Reconnect Connector: Reconnect the electrical connector.