Put a car repair sign up then yeah. Be more “quiet” about it and claim and you are fixing a friends car and it becomes less easy / an ordeal for the city or county to act. Unfortunately the car repair guy was not honest and that was an issue.
It turns out comprehensive zoning laws are not universal. HOAs are typically a response to inadequate (or at least perceived inadequate) zoning regulation.
However the concept of nuisance has existed in the common law for centuries and insofar as someone’s behavior might be a nuisance it has always been actionable.