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King of Smart Gadgetry
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The emission air pump runs for about 30 seconds while the heating elements on both 02 sensors are warming up to temp. To me the engine running for a minute on the rich side shouldn't be a big deal, but apparently Mercedes Benz thought it was a big deal. So they installed the air pump. If you open your tailgate and open the engine cover you can see the pump on your right almost over the fender well that is over the rear tire. I don't know if just unplugging the pump would throw an engine code or not. I haven't tried that. But my guess is it would. DCO
 
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