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The crankcase ventilation valve (also known as the PCV valve or breather valve) controls the flow of blow-by gases from the engine crankcase back into the intake system. It prevents pressure build-up in the crankcase that would cause oil leaks, and routes hydrocarbon vapours through the engine for combustion rather than releasing them to atmosphere. A faulty valve causes rough idling, oil leaks from seals and gaskets, increased oil consumption, and lean mixture fault codes. It is an inexpensive service item that should be inspected at regular intervals. At CarParts247 we stock crankcase ventilation valves for all popular petrol and diesel engines.
CCV valve failure typically causes either excessive crankcase pressure (valve stuck closed) or vacuum issues (valve stuck open).
The CCV valve is straightforward to inspect and replace. The replacement interval varies — some are replaced at every major service, others are replaced on condition.
Commonly searched OE numbers fitting PCV Valve from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.