Code P0018, where is the crankshaft position correlation Bank 2 sensor located?

The trouble code P0018 in your 2008 Mercedes Benz CLK 350 is associated with the engine's mechanical timing.

The "A" camshaft is typically the intake camshaft on the bank of the engine that contains cylinder

Here is the sensor location so you can check it out, but I have seen the camshaft actuator go out and cause this issue. Check out the images (below). Please let us know what happens.