OBD1 didn't have an industry standard, it was different for each manufacturer and hence what you can pull from a code reader is different. For instance my ODB1 miata(94) didn't have a data interface at all, just a blinking CEL. On the flip side ODB1 fords had a code reader that could at least pull some data, though I don't know how much. I have a code reader for one, but don't own an OBD1 Ford(long story)
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