why does my Skoda Octavia NFL (2020-Present) check engine light keep coming on

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Fault Codes

• Sub-step 1: Identify the trouble codes from the OBD-II scanner.
• Sub-step 2: Research each code to understand the underlying issues (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Prioritize repairs based on severity and likelihood of causing check engine light.

3. Repair or Replace Affected Components

• Sub-step 1: For issues with the oxygen sensor, remove the old sensor using an oxygen sensor socket and install a new one, tightening to manufacturer specifications (usually around 30 lb-ft).
• Sub-step 2: If the issue is related to the catalytic converter, replace it by unbolting from the exhaust system and installing the new unit, ensuring proper gasket sealing.
• Sub-step 3: For vacuum leaks, inspect all hoses and connections; replace any damaged or cracked hoses.

4. Clear Error Codes

• Sub-step 1: Reconnect the battery.
• Sub-step 2: Use the OBD-II scanner to clear the error codes and reset the check engine light.

5. Test Drive

• Sub-step 1: Take the vehicle for a test drive to ensure the check engine light does not re-illuminate.
• Sub-step 2: Monitor engine performance during the drive.

Tools Required:

• OBD-II scanner
• Oxygen sensor socket
• Torque wrench
• Socket set
• Screwdrivers

Parts Required:

• Oxygen sensor (if defective)
• Catalytic converter (if defective)
• Vacuum hoses (if damaged)

Estimated Repair Time: 1-3 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before servicing exhaust components.