Skoda Octavia NFL (2020-Present) battery dies overnight what could it be

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Battery and Terminal Inspection

• Inspect Connections:
  • Check the positive and negative battery terminals for tightness and cleanliness.
  • Clean any corrosion using a mixture of baking soda and water, followed by a thorough rinse and drying.
• Replace Battery if Necessary:
  • If the battery is old (over 3-5 years) or voltage testing shows it is below normal, replace it with a new battery.

3. Address Parasitic Draw

• Identify the Source:
  • Reconnect the negative battery terminal.
  • Set the multimeter to measure current and connect it in series with the negative cable and terminal.
  • Remove fuses one at a time to identify which circuit is causing excessive current draw.
• Repair Faulty Components:
  • Once the problematic circuit is identified, inspect and repair or replace the faulty component (e.g., light switch, glove box light, aftermarket accessory).

4. Reassemble and Test

• Reconnect all components and ensure all fuses are in place.
• Start the vehicle to ensure it runs properly and all electrical systems function correctly.
• Test drive the vehicle for a short distance to confirm the battery remains charged.