The complaints about OBD2 extension cables repeat with remarkable consistency: the scanner worked before the cable and not after it, the wireless adapter drops out, the plug wobbles, the cable is too short, or the cable is a tangle. Almost every one of those complaints has the same root, and it is rarely the scanner.
A wireless OBD2 adapter is only as good as its position, and that is where an extension cable earns its place. Plugged straight into a buried port, a wireless adapter can sit behind metal dash structure and drop its signal; moved a few feet on an extension, it sits in open air and talks to
The question in this guide’s title is awkwardly worded, so let us state it plainly: should the link between your car’s OBD2 port and your scan tool be wireless (a Bluetooth adapter on your phone) or a cable (a wired extension from the port to the tool)? The two sides solve different problems. Wireless wins