I have a 192 piece craftsmen toolset. It has allen wrenches, 1/4in, 3/8in, and 1/2in sockets (some deep, some 12pt, etc), and regular wrenches all both metric and SAE. Even though 90% of cars use completely metric (and I found out that all the bolts on my car are actually metric). And my other tools are a breaker bar, socket converters (1/2in to 3/8in, 3/8in to 1/4in, etc), a torque wrench, and a good ole can of penetrating lubricant. And I also have a multimeter, but I've had that for a while for other electronics uses. I also have jackstands. My car hasn't thrown any service engine soon lights for the whole time that it's been my responsibility (when it was my parents it had a few problems). As soon as it does i'll be getting a code reader, though. Although if you go to most auto parts stores, they will connect a code scanner for you for so that you can see any codes that your engine is throwing. IDK if it's free to do that though.