Emissions monitor(s) not ready at time of inspection. This does not necessarily mean there is an issue. Vehicle may simply need to complete a drive cycle.
(EGR (exhaust gas recirculation), FUE (fuel system) )
Stored / history data trouble code(s) are present in vehicle ECM.
(Check engine light is not currently on, Advise clearing code(s) and driving to see if comes back, This does not necessarily mean there is an issue, P0073)
Emissions system component tampered with or missing.
(Catalytic converter, Exhaust Gas Recirculation (EGR) system, D e f system has been removed also.)