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On a 2003 Nissan Altima, the Positive Crankcase Ventilation (PCV) valve is located on the engine's intake manifold. Specifically, it is typically found on the driver's side of the engine, connected to the valve cover. You may need to remove some components for better access, as it can be somewhat obstructed by other engine parts. Always consult the vehicle's service manual for detailed instructions and diagrams.

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2d ago

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http://nissanclub.com/forums/showthread.php?t=21778