That depends on what you're needing... If you have an error code (check engine light) they can check to see what it is and give you a print out of the code. There are several emissions related problems that will trigger the check engine light and/or effect gas mileage. No test that directly measures your emissions, but your O² sensor should be doing that for you already.
No you don't need emissions test in Ohio
I don't think so
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