The well-priced Ancel AD310 Code Reader does everything it should and more. The easy-to-use plug and play unit starts quickly and prompts you through each diagnostic step. It can reset I/M ...

Learn what that pesky dashboard light means before heading to the shop, and maybe save some cash in the process.

The best OBD ... any other scanner we've tested. Tom is the Tom's Guide UK Phones Editor, covering everything from new hardware to the best mobile apps. He's also an avid electric car enthusiast ...