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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off and cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Vacuum Hoses

• Tools Required: Pliers, socket set.
• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses with OEM parts.
• Ensure all connections are secure and free of leaks.

3. Clean or Replace MAF Sensor

• Tools Required: Torx screwdriver, MAF cleaner.
• Locate the MAF sensor, typically found between the air filter and throttle body.
• Remove the MAF sensor using the Torx screwdriver.
• Clean the sensor using MAF cleaner and let it dry before reinstalling.
• If the sensor is damaged or the cleaning does not resolve the issue, replace it.

4. Check Fuel System Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position (do not start the engine) and check the pressure.
• Compare the reading to the manufacturer specifications; replace the fuel pump or filter if pressure is below specifications.

5. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench.
• Inspect the upstream and downstream oxygen sensors for any signs of damage or contamination.
• If any sensor is faulty, remove it using the O2 sensor socket and replace it with a new one.
• Ensure the new sensor is properly connected and secured.

6. Reassemble and Reconnect

• Reconnect any disconnected components, such as vacuum hoses and electrical connectors.
• Reconnect the negative battery terminal.
• Clear the error codes from the ECM using an OBD-II scanner.