the accord of the car OBD2 and CAN Bus

Analogy: OBD advice agreement amid two computers, the CAN bus cable.
Whether it could be argued that there is no arrangement cable [CAN], even if the advice agreement amid two computers, or disability to communicate? Also like to call: OBD2 is the agreeable of the speech, CAN is a blast line.
OBD2 is if boundless car emissions, there is failure
Can wire advice lines, by a arrangement of advice transferred to addition arrangement or added systems,
That interface is the analytic interface, of course, can apprehend car advice arresting of anniversary system