SparkFun OBD2 to UART questions.

First off thanks for the opportunity to ask questions regarding the products being offered here. What I am wondering, is if the board itself if capable of bidirectional communication using a specific protocol.

I am looking to build something along the lines of an ECU simulator such as the ones available online, but would rather program it myself using an arduino along with the SF OBD2 to UART board. I guess what I am asking is that there are all kinds of projects showing a build that will request and show the codes being sent by the cars ecu, but is the board also capable of listening and then responding to a scanner reqesting these codes?

I am somewhat new to serial communication and will be learning alof of this on my own but would rather know it is at least possible with this hardware before I go ahead and purchase and start playing with it.

Again, thanks, and really looking forward to playing with this project, Eric.