Check Engine Light 1994 E320 Mercedes-Benz

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My problem is that the check engine light is on after taking my car to have the Serpentine belt changed. I check the impulse counter on my 1994 E320 Mercedes-Benz located in front of the battery. The LED blinks 18 "Adjustable camshaft timing solenoid or short circuit and 22 times cam position sensor signal defective. I want to know how close was the cam sensor or camshaft device to the Serpentine Belt to see whether by the shop changing the belt that they may have bumped the cam sensor connector and damaged it when changed the Serpentine Belt.