I know Mark's issue is tricky, because he is not getting a solid LED to switch to the test mode.
For me it was simple... in my post a few weeks ago, I figured it out...
I attached the meter, and looked for the 85% that my sons Cal spec car should have, and read the meter based that way.
The pics I posted on my thread make this very clear... not many words needed!

I think the real problem/question here is why is Marks car NOT giving the correct reading in KOEO mode?

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2009 Mercedes ML320 Bluetec