Al I want to know if this vehicle is OBD2.

IT IS 1996 ON UP

THE CONNECTOR SHOULD BE SOMEWHERE UNDER THE DASH, SORTA UNDER THE STEERING WHEEL.......MAYBE ON ONE SIDE OR THE OTHER....SOMETIMES THERE'S A DUST COVER OVER IT

IF YOU NEED CODING (CHECK ENGINE LIGHT IS ON)---MANY POPULAR AUTO PARTS STORE WILL SCAN IT FOR FREE.......WRITE DOWN THE EXACT CODE NUMBERS (NOT SOMEONE'S INTERPRETATION OF WHAT THEY MEAN)

THIS LINK MAY EXPLAIN AND HELP YOU ALSO......I SORTA DON'T TRUST "WORD OF MOUTH" WITH ANY PROJECT THAT MAY "COST ME", I CHECK BEHIND PEOPLE, SORTA MY OWN 2ND OPINION

https://www.2carpros.com/questions/1996-chevrolet-monte-carlo-would-case-code-po420-fix-problem

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THE MEDIC