Checked with my Ag dealer, sells big farm tractors and carries "small tractors" like Kubota. His input was that while the tractor may have an ODB port, the tractor isn't speaking Standardized ODB (today on cars its CAN bus, developed primarily for engine management to help emission management). Each brand of tractor has its own bus management system, standards, and protocols. When you buy a general scanner for tractors, they come with a specific "key" that is the protocol for your tractor that allows the scanner to communicate. So far there has not been a push for tractor brands to standardize their management protocols over the industry like automakers have done.