I hope I am making sense...

I dont understand what is right and wrong here...
a CA car should read 85% KOEO...
Landis says a Federal car with diagnostic code memory will read 70%...

Factory service manual says that a 30% reading is saying that the temp sender is faulty, but mine checks out fine... leaving it unplugged sets a code, which I erased...

Can someone enlighten me please????

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2009 Mercedes ML320 Bluetec