Sacramento County ban on home “major auto repair”

When all this was going on next door to me, the owner of that duplex got in contact with me, through the property management firm that he contracts to manage the property, as he's an absentee owner, living down in the San Francisco Bay area.
When he found out what his renters were doing, he didn't like it at all.
He spent 10K putting in a new concrete driveway, and don't know how much he had to spend renovating that side of the duplex, when the prior tenant(s) got evicted.
Doesn't wan't that new driveway, all oil stained, and then looking like crap.
He doesn't want any auto repairs on the property, so the tenants aren't complying with the rental agreement, also not complying with city, and county code.