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which systems are considered OBD emissions relevant & which ones are vehicle repair information?

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I am not interested in a particular car, but generally speaking, would like to know which systems are related directly to the OBD emissions area and which ones are commonly used in the vehicle repair information area.

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are the codes in the information display on dash the same as obd? all start with c
asked Nov 9, 2021 by teri4393 (101 points)

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