Can I file my own extension for MVA personal injury in Franklin county, OH? I am undergoing treatment and coming up on the 2 year statute.

You may certainly proceed pro se and file your own lawsuit.  if you do so, then you will be held to the same standards as would an attorney.  Thus, if your pleadings are insufficient, then your case may be dismissed by the Court. While you have the right to represent yourself, doing so is fraught with perils. There is such a thing called a "tolling agreement" in which all parties to a potential claim agree -- in writing -- to suspend the running of the statute of limitation on a claim until a certain date or event.  For an auto accident claim, there is really no reason for an insurance company to enter such an agreement.  These are sometimes used in medical malpractice claims. In my opinion, you should seek legal counsel.  Although we are located in Cincinati, we do handle cases in the Columbus area.