Appropriate repair definition

Appropriate repair means the diagnosis of the cause(s) of an emission test failure and/or the repair of one or more of these causes. An appropriate repair should reduce at least one emission test reading or diagnose and/or repair an emission problem identified by the on-board diagnostic (OBD) system.
Appropriate repair means the diagnosis or repair of the cause(s) of an emission test failure.
Appropriate repair means the diagnosis of the cause(s) of an emission test failure and the repair of one or more of these causes. An appropriate repair should reduce at least one emission test reading.