What is the proper way to reset a vehicle's fault codes after repairs?

Using a scan tool is the proper way to reset a vehicle's fault codes after repairs because it allows for a systematic and targeted approach to resetting codes. Scan tools not only reset the codes but also provide the ability to read the live data, verify that repairs were successful, and check for any pending codes. This process ensures that the vehicle's onboard computer correctly reflects the current status of the system and confirms that the issues have been resolved.

In contrast, disconnecting the battery can temporarily clear the stored codes, but it also resets other important systems in the vehicle and may lead to loss of learned parameters that are important for engine performance and vehicle operation. Restarting the vehicle and driving it for a period does not guarantee that fault codes will be cleared, as it may simply reactivate the same codes if the fault still exists. Clearing codes using the vehicle's diagnostic system could be an appropriate method but may be less specific than using a professional scan tool, especially if the system has advanced features. Therefore, utilizing a scan tool is the most accurate and effective method to ensure the vehicle's computer systems are properly reset after completing repairs.