Yes, the scanner is a must have tool for the 98' and up cars now. Even with the scanner it does tell you how to fix the problem, it will tell you what's not working correctly, so now you need to find out the reason. I go down the check list and check out all the possibilities, usually with an OHM meter, so not to buy something I don't need. Our old cars not charging, is not always a bad alternator, it could be a loose belt, regulator gone bad or even a bad wire. Trial and error!!!!