What should be done if warning lights appear after repair?

• A. Ignore the warning lights
• B. Replace the entire electrical system
• C. Repaint the dashboard
• D. Scan for diagnostic trouble codes

Answer: (D)

Warning lights after a repair mean the vehicle’s computer has detected something that isn’t right in the system you just worked on or in a related system. The best first step is to scan for diagnostic trouble codes with a scan tool. Those codes point to the exact circuit, component, or module involved, helping you identify the real issue without guessing. Once you retrieve the codes, you verify the problem, perform any needed tests or repairs, and then clear the codes if the fault is fixed and test the system to confirm the light stays off. Ignoring the lights or replacing the entire electrical system or repainting the dashboard won’t fix the underlying problem and wastes time and money.