my Skoda Octavia's engine light is on but no codes are showing what should I check

Solution

1. Preparation

• Tools Needed: OBD-II scanner, multimeter, visual inspection tools (flashlight, mirror).
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery (negative terminal) to eliminate power while inspecting wiring.

2. Inspect Battery and Connections

• Sub-steps:
  1. Use a multimeter to check the battery voltage (should be around 12.6 volts).
  2. Tighten any loose battery connections; clean terminals if corroded.

3. Check Fuses

• Sub-steps:
  1. Locate the fuse box (refer to the owner's manual for location).
  2. Inspect fuses related to the engine control unit; replace any blown fuses.

4. Inspect Wiring and Connectors

• Sub-steps:
  1. Examine the wiring harness for damage, fraying, or wear.
  2. Check connectors for corrosion, dirt, or loose connections; clean and secure as necessary.

5. Reconnect Battery and Test

• Sub-steps:
  1. Reconnect the negative terminal of the battery.
  2. Start the engine and observe if the check engine light remains illuminated.