The IMready device plugs into the OBD2 port and runs the equivalent of the California OBD-II emissions pre-test. When connected, the user will see a yellow light indicating the test is running. After the test has completed, it will either show a green light if the car passed the test, or a red light if it failed. With the pre-test, the customer simply waits until they get a green light before they go back to the smog station for a test.
