What is the symptoms of a bad Pvc valve on a 2006 Nissan Xterra 4.0?

Symptoms of a bad PCV valve on a 2006 Nissan Xterra 4.0 can include rough idling, increased oil consumption, and excessive engine noise. You might also notice a decrease in fuel efficiency and oil leaks due to increased pressure in the crankcase. Additionally, the check engine light may illuminate if the engine management system detects issues related to the PCV system.