Several automakers introduced OBD computer interfaces, for their own cars before the 1990s.

But, the push to standardize everything with OBD, really didn’t begin until 1991. As a result of, the California Air Resources Board (CARB) mandated that all cars sold in California, needed some form of capability.

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OBD-I – Trouble Code Information, For Honda 95 & Earlier Models

OBD Engine Codes And Warning Lights, Are Only A Messenger

Check Engine Light (CEL) – What Can Cause It To Come On

Dash Warning Lights Only Provide A Warning, Something Is Wrong