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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to avoid electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or propane torch (carefully) to detect vacuum leaks.
  • Replace any damaged hoses or repair any leaks found.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector from the MAF sensor.
  • Remove the MAF sensor using a Torx or socket driver.
  • Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Repair Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail to check fuel pressure (should be within manufacturer specifications).
  • If pressure is low, inspect the fuel pump and relay for proper operation.
  • Check fuel injectors for proper function and clean them if necessary.
  • Replace any faulty components as needed.

5. Check Oxygen Sensors

• Sub-steps:
  • Locate and disconnect the upstream and downstream oxygen sensors.
  • Test the sensors using a multimeter to ensure they are functioning within specifications.
  • Clean or replace any faulty oxygen sensors.