What is the OBD system?
OBD is an acronym for "On-Board Diagnostics", standardized as OBDII (OBD 2) in 1997. Through OBDII, the car's computer monitors all important subsystems and can report failure codes for any of those subsystems when something goes wrong.
You didn't drive very far to that emission station, did you? If the engine and transmission aren't fully warmed up when you get there, they won't be able to get reliable status codes from the computer... so you should be sure that the car is fully warmed up from driving before you arrive to be tested.
on Aug 05, 2014