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I read that some 1994 veichales were OBD II compatible. Is a 1994 Chevrolet Suburban OBD II compatible ?

Yeah my bros sub gets the Check engine light on when he turns off the a/c.

Answer:
OBD 1 came out in 94, all vehicles that had OBD capable systems in that year are OBD 1..some 95 had OBD 2 but few.. all 96 and newer are OBD 2..

All 1996 and above vehicles are OBD II compliant and it means they have OBD II system in their vehicles. It was only made mandatory for vehicle manufacturers to make OBD II compliant in 1996. All vehicles before 1996 are not OBD II but OBD I.

don’t think so it was higher end cars for GM you can tell by the shape of the ADL connector.

it’s an “ALDL” connector