The flywheel RPM sensor has a magnet located on the end of the sensor which senses breaks between the ring gear teeth, the sensor relays this information back to the main Bobcat controller which registers the RPM of the engine.
The flywheel RPM sensor is located just above the starter on the left side of the engine.
Code 06-13 will occur if the main Bobcat controller loses the signal for the flywheel RPM sensor. The inability to unlock the traction lock (brake) is a symptom of losing the flywheel RPM sensor signal. Not being to read engine speed on the service tool or deluxe display panel is also a symptom of losing the flywheel RPM sensor signal