只要$12。在有些车上极其容易换，比如Sienna， 就在发动机最上面，眼皮底下。
A PCV (positive crankcase ventilation) valve regulates the flow of gases from the engine's crankcase into the intake manifold, preventing harmful vapors from building up and being released into the atmosphere. If the valve fails, common symptoms include rough idling, increased oil consumption, engine oil leaks, and a check engine light. A clogged PCV valve can also lead to internal engine sludge, so regular checks and replacement, typically around every 30,000 miles, are important for engine health.
