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Why does my computer not show cars during an inspection when they tested their computer?

went to get my car inspected and a tire and other light break they said it can not be inspected because the car would not be visible on their computers. Could be a loose wire? I have no idea. Can someone give me an idea what the problem could be? is a 2001 Pontiac sunfire the check engine light is not lit, the machine shop owned by my husband and cousin is a store house.

there was a communication error between your car's computer and theirs. It could be the fault of their computer or a problem with communication lines on your car. Computers use a serial data line, or CAN communication, to "talk" to other modules on the vehicle, as the controller abs, air bag controllers, body, or diagnostic equipment. Now in my experience, alternative diagnostic equipment that is somewhat generic, as it is designed to be used on all car brands, foreign or domestic, against a specific diagnostic tools OEM ie GM or Ford or Hyundai, which is designed to be used specifically on their cars only. So it could be a flaw in the hardware and software diagnostic equipment, or there is a communication error being caused by a faulty engine computer or a problem with the communication line on the diagnostic connector. it might even be as simple as not having power to diagnostic connector, but it seems like a place that inspections have been able to understand it and use a external connection to the battery.

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