why does my Skoda Octavia's check engine light stay on

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before beginning work.

2. Address Diagnostic Codes

• Based on the OBD-II scanner results, identify the specific fault codes.
• Research the codes to determine the underlying issues and required repairs.

3. Replace Faulty Components

• If codes indicate a faulty oxygen sensor:
  • Remove the oxygen sensor using a socket wrench.
  • Install the new oxygen sensor and torque to manufacturer specifications (typically 30-40 Nm).
• If ignition components are faulty:
  • Remove spark plugs and inspect for wear or deposits.
  • Replace with OEM spark plugs and torque to specified values (usually 20-30 Nm).
  • Replace ignition coils if indicated.

4. Clear Codes and Reconnect Battery

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the fault codes.

5. Test Drive

• Start the engine and allow it to idle for a few minutes.
• Conduct a short test drive to ensure the check engine light does not reappear.