Replacing a camshaft sensor on 1997 Ford Taurus

My engine is already being repaired for a head gasket leak, which is a lengthy repair laborwise. Now they found that the camshaft sensor is broken. Will the cost of labor to replace the camshaft sensor be less since they are already working on the engine?

Asked by for the 1997 Ford Taurus
I would ask the shop doing the work, it may not be any additional price.