I am trying to read the voltage from my Lamba sensor so I can see if the car is running too rich/lean as my misfire is *almost* gone now.

I have the positive pin of my multimeter in the Lamba sensor wire (the black one that plugs into the green wire in the passenger floor)....and the ground attached the chasis (tried different ground positions too)....

...but I'm getting no voltage read at all.

Am I missing something here???

I have the multimeter set to read volts....I tried both AC and DC modes...It was a pretty expensive Craftsman one so it can't be the multimeter....its only a month old.

Any ideas?

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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