When a warning light appears after service, what diagnostic step is recommended?

When a warning light appears after service, what diagnostic step is recommended?

• A. Scan for diagnostic trouble codes
• B. Check tire pressure
• C. Change the oil
• D. Reset the radio

Answer: (A)

When a warning light appears after service, the best next step is to scan for diagnostic trouble codes using the vehicle’s OBD system. Reading these codes gives specific information about which system or sensor triggered the warning, pointing you to the exact area that needs inspection or repair. It moves you beyond guesswork and helps ensure the underlying issue is addressed before the light can be reset. Other options don’t address the fault: tire pressure checks are routine maintenance, changing the oil is unrelated to diagnostic warnings, and resetting the radio has no effect on engine or safety indicators.

When a warning light appears after service, the best next step is to scan for diagnostic trouble codes using the vehicle’s OBD system. Reading these codes gives specific information about which system or sensor triggered the warning, pointing you to the exact area that needs inspection or repair. It moves you beyond guesswork and helps ensure the underlying issue is addressed before the light can be reset. Other options don’t address the fault: tire pressure checks are routine maintenance, changing the oil is unrelated to diagnostic warnings, and resetting the radio has no effect on engine or safety indicators.