Is the PCV valve spring undamaged and the PCV valve free from blockage?
Test the system for normal operation. If the concern persists,
REFER to: Engine
(303-01G Engine - 1.6L Duratorq-TDCi (70kW/95PS) (T3), Diagnosis and Testing).
CLEAN the PCV oil separator and PCV valve assembly or INSTALL a new engine valve cover as necessary. Test the system for normal operation.