Ohio Rev. Code Ann. § 3737.221
(C) The fire marshal, the chief deputy fire marshal, and any assistant fire marshal is immune from liability for injury, death, or loss to person or property caused by the operation of any motor vehicle upon the public roads, highways, or streets in the state when acting within the scope of division (A)(2), (4), or (14) of section 3737.22, or section 3737.24 or 3737.26, of the Revised Code, without regard to the proximity of that operation to the office of the fire marshal, unless one of the following applies: