how to fix P0174 code on Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fuel pressure gauge, vacuum gauge, cleaning solution for sensors.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect for Vacuum Leaks

• Visually inspect all hoses and connections in the intake system.
• Use a vacuum gauge to check for proper readings; a reading significantly below normal indicates a leak.
• If leaks are found, replace or tighten affected hoses and connections.

3. Clean Mass Air Flow (MAF) Sensor

• Locate the MAF sensor in the intake air duct.
• Carefully remove the MAF sensor using a socket set.
• Spray MAF sensor cleaner onto the sensor elements (do not touch them).
• Allow it to dry completely before reinstallation.

4. Check Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail's service port.
• Start the engine and observe the pressure reading; it should match the manufacturer's specifications (typically between 55-75 PSI).
• If the pressure is low, check the fuel pump and fuel filter for issues.

5. Inspect Fuel Injectors

• Disconnect the electrical connectors from each fuel injector.
• Use a multimeter to check for proper resistance; it should match manufacturer specifications.
• If any injectors are faulty, replace them with new ones.

6. Test Oxygen Sensors

• Use the OBD-II scanner to monitor the oxygen sensors' output.
• Check for any signs of malfunction; if they respond slowly or show incorrect readings, replace the faulty sensors.