RepairPal Certified shops can diagnose and repair your 2009 Toyota Yaris. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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There is no special procedure listed here. The PCV valve unthreads. Perhaps it will take more force to remove it, but there's no trick I am aware of.
Are you replacing the valve for regular maintenance? Or is there a problem you are trying to resolve?