OBD2 was a standard put into place to make every car have the same diagnostic port and keep all the codes the same across all makes and models. As a positive side effect, that change made scan tools more affordable and easy to use, which helped make DIY diagnostics and repairs more reasonable. With that in mind, OBD3 should be another step in the right direction, but will it be? The only way to know for sure is when we start hearing about it when it comes out, but speculation is fun. Cars Simplified video.