how to fix P0174 code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set
• Remove engine cover if applicable.
• Inspect all air intake hoses for cracks or leaks. Replace any damaged hoses.
• Check the intake manifold for leaks using a smoke machine if available.
• Reinstall any components removed for access.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner spray, Torx screwdriver
• Locate the MAF sensor in the air intake duct.
• Carefully disconnect the electrical connector.
• Remove the MAF sensor using a Torx screwdriver.
• Spray MAF cleaner on the sensor element and allow it to dry completely before reinstalling.
• Reconnect the MAF sensor and ensure the connector is secure.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "On" position without starting the engine to check the fuel pressure.
• Compare the reading to the manufacturer's specifications. If it's low, check the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter (optional)
• Locate the upstream and downstream oxygen sensors.
• Use an O2 sensor socket to remove and inspect them for damage or contamination.
• If necessary, replace faulty sensors with OEM parts.

6. Verify Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter
• Disconnect fuel injectors from the wiring harness.
• Use a multimeter to check the resistance of each injector; compare readings against specifications.
• If any injectors are faulty, replace them, and consider using fuel injector cleaner in the fuel system.