my Skoda Octavia NFL (2020-Present) has a check engine light on with no codes

Solution

1. Preparation

• Gather tools and materials needed for inspection and repair.
• Disconnect the battery before performing any further work to prevent electrical damage.
• Tools Required: OBD-II scanner, multimeter, socket set, visual inspection tools.

2. Inspect and Tighten Fuel Cap

• Remove the fuel cap and inspect it for damage or wear.
• Clean the fuel filler neck with a cloth to ensure a good seal.
• Reinstall the fuel cap securely and ensure it clicks into place.

3. Check Electrical Connections

• Locate the ECM and inspect the wiring harness for any loose connections or signs of corrosion.
• Clean any corroded terminals with an electrical contact cleaner.
• Reconnect any loose connectors securely.

4. Monitor Live Data

• Reconnect the battery.
• Start the engine and use the OBD-II scanner to monitor live data parameters such as fuel trims and oxygen sensor readings.
• Look for abnormalities that could indicate underlying issues.

5. Test the Battery and Charging System

• Use a multimeter to check the battery voltage; it should read between 12.4V and 12.7V when the vehicle is off.
• Start the engine and check the voltage again; it should be between 13.7V and 14.7V with the engine running.
• If readings are outside of these ranges, consider replacing the battery or alternator as necessary.