Well the car is California, but does not have the diagnostic. Were all pre-88 cars "federal"?

I know how to pull the duty cycle reading...I just had some weird results before so I am checking that I am not missing anything here.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k