On a 2004 Chevrolet Impala, the Positive Crankcase Ventilation (PCV) valve is typically located on the valve cover, near the rear of the engine. It is often connected to a rubber grommet and may have a hose leading to the intake manifold. To access it, you may need to remove any obstructions like the engine cover or other components depending on the specific engine setup. Always consult the vehicle's service manual for precise locations and instructions.
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