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Crankcase Vent Valve Information

Early vehicle manufacturers did not put much thought into emissions control. With modern environmental standards and air-quality regulations, though, makers of cars, trucks and SUVs had to come up with a way to reduce emissions. A popular way is with the installation of positive crankcase ventilation. Like other vehicle functions, positive crankcase ventilation requires a control valve. has crankcase breather valve parts for hundreds of different vehicles. As such, if your car has a worn out, damaged or ineffective crankcase vent valve, we probably have the high-quality and affordable part you need to pull off a successful and confident repair. Even better, because of our 30-day return policy, you don't have to worry about getting stuck with the wrong component. Instead, if you aren't happy with your purchase, you can return the part for a full refund.

What is a crankcase vent valve?

In an effort to reduce emissions, vehicle manufacturers began installing positive crankcase ventilation systems on cars, trucks and SUVs. An early approach to emissions control, the positive crankcase ventilation system pulls engine emissions from the oil pan and the bottom of the engine through the intake manifold. This process directs emissions back into the engine where they burn in the combustion chamber instead of exiting into the air. The crankcase vent valve, also called the crankcase breather valve, regulates the flow of gases from the crankcase into the engine's cylinders. To do so, it must open and close on a precise schedule. The valve usually lives at the end of a hose, inside a grommet on the valve cover.

How much does a crankcase vent valve cost?

An old, damaged or ineffective crankcase vent valve can give you headaches. It can also result in rough idling and poor engine performance. If you want to pass your next emissions test, you should replace a bad crankcase breather valve as soon as possible. Luckily, taking care of the problem is not likely to be out of financial reach. In fact, at, most replacement valves cost around $60. The exact cost for replacing your crankcase vent valve, though, depends on a variety of factors, including your vehicle's make, model and year. You may also pay a premium for an OEM valve or one with high-end construction or design.

What are the symptoms of a bad crankcase vent valve?

Even though crankcase vent valves may eventually wear out or break completely, servicing them is not usually on anyone's maintenance schedule. Still, if you have a bad valve, you are apt to experience a variety of vehicle problems. Not insignificantly, your car, truck or SUV may not pass an emissions inspection. Unfortunately, however, the symptoms of a bad crankcase vent valve are often the same as other vehicle problems, such as a bad distributor or fouled spark plugs. Testing your vent valve is the best way to determine if it requires replacement. If you notice any of the following, nonetheless, you should investigate whether your crankcase vent valve has gone bad:

  • Rough engine idling
  • Excessive oil consumption
  • Leaking oil
  • Dirty breather element
  • Poor vehicle performance
  • Failed emissions inspection

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Some of our Customer Reviews
Very Satisfied
Reviewer: GNelson, Vermont

Great fit, quick service, and fairly priced! I will be ordering again.

2002 BMW 325xi Crankcase Vent Valve and Breather Hose Kit

Somewhat Satisfied
Reviewer: Chris

Parts geek always has the best products for low prices everyday

2004 BMW 325i Crankcase Vent Valve and Breather Hose Kit

Very Satisfied
Reviewer: CCV Valve Kit

Parts fit perfectly and solved smoke from exhaust problem

2001 BMW 525i Crankcase Vent Valve and Breather Hose Kit

Very Satisfied
Reviewer: DesertDude760

easy installation and good quailty fast shipping recieved early.thanks for the excellent experience

2002 BMW 325Ci Crankcase Vent Valve and Breather Hose Kit

Very Satisfied
Reviewer: Lawrence

Very good part fast delivery and excellent service I will definitely order again

2002 BMW 525i Crankcase Vent Valve and Breather Hose Kit

Very Satisfied
Reviewer: Sanchez

Perfect fit. Reasonable price. Definitely shopping here again.

2004 BMW 325i Crankcase Vent Valve and Breather Hose Kit