The 1988 Mercury Cougar diagnostic port can be found under the hood.
under drivers side dash next to the hood release
That would be the OBD I Diagnostic Connector.
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1988 cougar will not crank over
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Looking for the 2000 grand vitara diagnostic port
i belive itb is under the drivers seat under a plastic box.
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Passenger side fender near strut tower
By your knee under the steering column.... right hand side if your driving the RH steering version