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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the vehicle’s battery.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or propane enrichment method to identify leaks.
  3. Replace any damaged hoses or gaskets found during inspection.
• Tools Required: Smoke machine or propane torch, pliers, replacement hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Remove the MAF sensor from its housing (typically requires a Torx screwdriver).
  3. Clean the sensor with MAF cleaner spray; do not touch the sensor element.
  4. If cleaning does not resolve the issue, replace the MAF sensor with a new one.
• Tools Required: Torx screwdriver, MAF cleaner spray.

4. Check Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) to check fuel pressure; it should meet manufacturer specifications (usually around 50-60 psi).
  3. If pressure is low, check the fuel pump, filter, and fuel lines for clogs or failures.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail (ensure to relieve fuel pressure first).
  2. Inspect injectors for clogs or physical damage.
  3. Clean injectors with a professional cleaning kit or replace if necessary.
• Tools Required: Socket set, injector cleaning kit.

6. Replace Oxygen Sensors (if necessary)

• Sub-steps:
  1. Identify the downstream oxygen sensor for bank 2.
  2. Remove the sensor using an oxygen sensor socket.
  3. Install the new oxygen sensor and torque it to the manufacturer’s specifications.
• Tools Required: Oxygen sensor socket, torque wrench.