You set the terms. He can live by them or get out. When you make demands such as this one, know that what you're asking for is important and not trivial. Return the crisis. Put the choice back on his lap.
Compliance is unconditional and non-negotiable.
Kids come up with a lot of them. Be sure there's plenty of gas if he's expected to mow the lawn. See he has a ride to outpatient counseling. Compliance is increased in the face of necessity and the absence of excuses. Give kids what they need, not what they want.