While a basic OBD-II scanner will suffice for reading and clearing codes, a more advanced scanner with live data capabilities (allowing you to monitor sensor readings in real time) would be significantly more helpful for diagnosing more complex issues. Some even offer bidirectional control, letting you actuate components to test their operation.
Beyond an OBD-II scanner, other useful tools depending on the suspected problem might include:
* Multimeter: To test electrical circuits and components.
* Test light: A simpler alternative to a multimeter for basic electrical checks.
* Mechanic's tools: Wrenches, sockets, screwdrivers etc., will be needed for any repairs once the problem is identified.
The OBD-II scanner is the starting point though; it helps direct further diagnosis.
