How Do You Tell If The Crankcase Vent Valve Is Bad In Your BMW X5

PCV valve or crankcase vent valve is a critical emission control device. It is tasked with the job of routing blow-by gases from the crankcase to the combustion chamber via the intake manifold. However, if it fails, your car engine would run rough and abruptly cease operation. Therefore, signs of PCV valve failure in your BMW X5 should not be overlooked.
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