A couple months ago, I did a review on MUCAR’s JS501 2-in-1 Jump Starter/OBD2 Scan Tool. I found it to be a useful tool that comes in really helpful when you need to check for engine trouble codes or if you need to jump start a dead battery. MUCAR supplied me with their more powerful JS502 Jump Starter with OBD2 Scanner, which is essentially the same unit but with a higher capacity battery and more powerful jump starter for bigger engines.