An oxygen sensor wrench is specially designed to check, remove, or install oxygen sensors, which are often located in confined spaces.

Oxygen sensor wrenches, which may be of the socket or claw type, come in a variety of forms, although the standard size is 22-mm (7/8 inch). Some are heavy duty or have a pneumatic action for use on rusted or baked-on sensors. Others have an opening or slot down the side to avoid having to cut the wires leading to the sensor if the device is only being checked.

Most oxygen sensor wrenches will work with the majority of sensors found on vehicles. Sets are available which may contain a number of different sockets and wrenches, including offset wrenches, heated oxygen sensor sockets, and vacuum switch sockets.