how to fix P0174 code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, socket set, torque wrench, MAF cleaner, multimeter.
• Safety Warnings: Disconnect the battery before starting work on electrical systems. Allow the engine to cool down before inspecting components.

2. Inspect for Vacuum Leaks

• Start the vehicle and listen for hissing sounds around the intake manifold and vacuum lines.
• Use a vacuum gauge to check for proper readings. A significant drop may indicate a leak.
• If a leak is found, replace the damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Disconnect the MAF sensor's electrical connector.
• Remove the MAF sensor from the air intake duct using the socket set.
• Clean the sensor with MAF cleaner according to the manufacturer's instructions. Let it dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail service port.
• Turn the ignition to the ON position to pressurize the system without starting the engine. Record the pressure reading.
• Compare the reading with the manufacturer's specifications. If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Remove the fuel rail to gain access to the fuel injectors.
• Visually inspect the injectors for any signs of clogging or damage.
• Use a multimeter to test the resistance of the injectors; replace any that are outside the specified range.

6. Verify Engine Coolant Temperature Sensor

• Locate the engine coolant temperature sensor and disconnect the connector.
• Use a multimeter to measure the resistance of the sensor. Compare the reading to the specifications in the service manual.
• If the readings are incorrect, replace the sensor.