1998 Ford Mustang CEL stays on

Check engine light wont go off. I have had the codes ran twice. Both times it said PCV Valve. It has now been replaced twice, it still wont stay off.

A DTC (diagnostic trouble code) is not intended to inform one which part to replace (too bad it’s not that simple), it is meant to tell one which system or systems (comprised of many parts/components) is detecting a problem. Proper diagnosis of the PCV system and other engine inputs to that system need trouble shooting by a knowledgeable auto technician.
:palm_tree: :sunglasses: :palm_tree:


+1 to @common_sense_answer Agree completely.