User's Manual

10 | P a g e
4.3 Sensor Lock nuts and wrench
FOBO Tire sensors and In-car unit are tied to a FOBO account after installation. They are
not re-usable or transferable without the owner releasing them from his/her FOBO
account. This is a theft deterrent feature to discourage theft.
As an additional anti-theft feature, all FOBO Tire package comes with lock-nuts and
special wrench. Note that it is not necessary to use the lock nuts if user values
convenience as higher priority than worrying about sensors being stolen. Not using the
lock nuts will not affect functionality of FOBO Tire.
The lock nuts and wrench are made of special engineering plastics that can withstand
road salts and common automotive chemicals (gasoline, engine oil, car wash shampoo,
etc).
In order to use the lock nuts, first install the lock nut to the tire valve (with the bump
facing tire rim). Screw in all the way down to make way for the sensor unit. Next, screw
in the sensor unit until it is reasonably tight. Then use your finger to unscrew the lock nut
upwards until it pushes against the bottom of the sensor unit. Use the wrench to tighten
the lock nut. The resultant friction force will make it difficult to remove the sensor unit
without loosening the lock nut. For rubber valves, hold the sensor unit with one hand and
tighten the lock nut with the wrench on another hand. This to avoid the rubber valve from
twisting making it unable to tighten the lock nut.
WARNING: Do not apply too much force to tighten the lock-nut. You may face
difficulty to loosen the lock nut later on.
Use the key chain provided to keep the wrench together with your car keys, so that you
don’t have to worry about misplaced wrench when you need to remove the sensors when
adding air to your tires.