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.