how to troubleshoot warning lights on Volkswagen Passat B8 (2015-2022) dashboard?

Solution

1. Preparation

• Gather necessary tools and safety equipment.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Address Error Codes

• Sub-step 1: Clear the error codes using the OBD-II scanner.
• Sub-step 2: Take the vehicle for a short drive to see if the warning lights reappear and check for any new codes.

3. Fluid Replacement (if required)

• Sub-step 1: If any fluid levels were low, replace them with the correct type as specified in the owner's manual.
• Sub-step 2: Properly dispose of old fluids according to local regulations.

4. Battery Inspection

• Sub-step 1: Clean battery terminals with a wire brush if corroded.
• Sub-step 2: Tighten connections and check for any signs of a failing battery, such as bulging or leaking.

5. Wiring and Electrical Checks

• Sub-step 1: Inspect wiring harnesses for frayed or damaged wires, especially near connectors.
• Sub-step 2: Use a multimeter to test continuity in suspect wiring.