TMZ Sports broke the story ... Manziel's Nissan GTR sustained all sorts of damage to the driver's side of the car this week ... in an incident that also set off his airbags.
We spoke with Manziel's rep, Denise Michaels, who tells us ... "Johnny told me his car was T-boned and the driver just rode away right after. He reported it to police."
But here's the weird thing ... we spoke with Dallas PD and as of Tuesday afternoon, we were told there was no record of an incident involving Manziel.