I find it extremely hard to believe there is "code" for parking a vehicle outside your garage
A boat or trailer? Perhaps. An HOA? Sure.
You can, however it must have an unexpired tag on it, registered and insured. My flat tired lawn mower is not one of those things. It's considered Junk
Section 23-98
Any Junk must be located in a completely enclosed structure or removed from the property. Junk shall not be parked, stored, or maintained in the open unless it is necessary for the execution of a business enterprise lawfully situated on private property. All yards, open areas and vacant lots on which Junk is located are declared a nuisance detrimental to the public health, safety and welfare, and the said nuisance shall be abated as herein provided.
Junk means tangible personal property having little, or no, value other than nominal salvage value, and which has been left, placed, parked, or stacked unprotected from the elements, on a trailer or truck bed or outside of a structure, and shall include wrecked, inoperative, dilapidated or partially dismantled motor vehicles, trailers, boats, machinery, home appliances, refrigerators, washing machines, plumbing fixtures, furniture and any other similar articles.