My 2006 W211 E-350 Wagon is running fine and just passed smog but I found a P2006 code stored that will not stay cleared. It states "Tumble Flap Intake Manifold, open circuit of sensor lines, Tumble Flap Shafts Stuck in Non actuated position"

Questions:
-Critical to fix now or o.k. to wait until "I get around to it"?
-Expensive?
-Shop or do at home?

Many thanks for good advice!

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