why does my Skoda Octavia NFL (2020-Present) check engine light come on randomly

Solution

1. Preparation

• Gather all 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. Retrieve and Analyze Error Codes

• Use an OBD-II scanner to connect to the vehicle's diagnostic port.
• Record all error codes and refer to the vehicle’s service manual for code definitions.

3. Inspect Wiring and Connections

• Reconnect the battery.
• Visually inspect all wiring and connectors related to the engine control unit (ECU).
• Repair any damaged wiring or loose connections found during the inspection.

4. Check Fuel System

• Use a fuel pressure gauge to measure fuel pressure at the fuel rail.
• If pressure is low, inspect the fuel pump and fuel filter for blockages or failures.
• Replace the fuel filter if necessary and ensure the fuel pump is functioning correctly.

5. Vacuum and Intake System Inspection

• Perform a smoke test to identify any vacuum leaks.
• Seal any leaks found in vacuum hoses or the intake manifold.
• Clean the throttle body and intake manifold if carbon buildup is present.

6. Ignition System Maintenance

• Remove the spark plugs and inspect for wear, carbon buildup, or damage.
• Replace spark plugs if they are worn out or if the gap is incorrect.
• Test ignition coils using a multimeter to ensure they are within specifications; replace any faulty coils.