what are the common causes of P0171 code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent any electrical issues.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Fuel pressure gauge
• Clean cloths

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and intake manifold gaskets for cracks or damage.
  2. Use a smoke machine or propane to detect leaks in the intake system.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the sensor using a socket set.
  3. Clean the MAF 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.

4. Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (but do not start the engine) and check the fuel pressure; it should meet manufacturer specifications.
  3. If pressure is low, check the fuel filter and fuel pump for proper operation, replacing as necessary.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Use a multimeter to test the voltage output of the upstream O2 sensor.
  3. Replace the sensor if it does not meet specifications.