my Volkswagen Golf MK7.5 (2020-Present) has a check engine light on what does it mean

Solution

1. Preparation

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

2. Address Diagnostic Trouble Codes

• Sub-step 1: Identify the specific DTC from the OBD-II scanner.
• Sub-step 2: Research the DTC to understand the required repairs (e.g., if it's related to the oxygen sensor, further testing will be needed).

3. Repair the Identified Issue

• Sub-step 1: If the issue is a faulty oxygen sensor:

  • Tools Required: O2 sensor socket, wrench, multimeter
  • Instructions:
    • Disconnect the wiring harness from the sensor.
    • Use the O2 sensor socket to unscrew the old sensor.
    • Install the new sensor and tighten to the specified torque (typically 30 Nm).
    • Reconnect the wiring harness.

• Sub-step 2: If a vacuum leak is detected:

  • Inspect and replace any damaged hoses.

• Sub-step 3: For a faulty spark plug:

  • Remove the ignition coil using a socket.
  • Replace the spark plug with a new one (set gap according to specifications).
  • Reinstall the ignition coil and ensure it is secure.

4. Reconnect Battery

• Reconnect the negative battery terminal and ensure it is tight.

5. Clear Codes

• Use the OBD-II scanner to clear the check engine light codes.