What is Subaru PCV valve?

The PCV (Positive Crankcase Ventilation) valve is an important component of a Subaru engine’s emission control system. Its main function is to regulate the flow of crankcase gases, preventing the buildup of pressure inside the engine and reducing harmful emissions. The PCV valve allows the gases to be recirculated back into the intake manifold, where they can be burned in the combustion process.
If the PCV system malfunctions, several symptoms may arise, such as smoking from the tailpipe, high or erratic engine idle speed, or issues with the dipstick or oil cap .
It is recommended to regularly inspect and replace the PCV valve to ensure proper engine performance and emission control. The frequency of replacement may vary depending on the specific Subaru model and driving conditions. As a general guideline, it is advisable to replace the PCV valve every 30,000 miles or every 3 years, although more frequent replacement may be necessary for vehicles that undergo short, quick trips.
Please note that the specific PCV valve part number may vary depending on the Subaru model and year. It is important to use genuine OEM Subaru parts for optimal performance and compatibility.
Remember to consult the vehicle’s owner’s manual or contact a Subaru dealership for the exact replacement interval and part number for your specific Subaru model.
I hope this information helps! Let me know if you have any other questions.

Contents

What happens when PCV valve goes bad?
Can a PCV valve throw a code?
How do I know if PCV valve is bad?
What does your PCV valve do?
What are the three signs of a bad PCV valve?
What is the lifespan of a PCV valve?
When should I replace my Subaru PCV valve?
Can you drive a car with a bad PCV valve?
Can you tell if a PCV valve is bad?
How much is a PCV valve for a Subaru?

What happens when PCV valve goes bad?

When your PCV valve is malfunctioning, it throws the air to fuel mixture out of balance and can lead to poor performance and rough idle, as well as misfires. In the very short term, these issues should not damage your car, but if you don’t fix the issue, you can do lasting damage, so it’s best to get it fixed promptly.

Can a PCV valve throw a code?

If the device detects a problem with the PCV system, it will turn on the check engine light and store a corresponding diagnostic trouble code in memory. A stuck-open PCV valve can also disrupt the air-fuel mixture and cause misfires that trigger the check engine light.

How do I know if PCV valve is bad?

How to Determine If You Have a Bad PCV Valve. The easiest way how to tell if PCV valve is bad is to remove it from the engine and shake it. If you can hear it rattle, all should be fine. If not, it might signal that the valve is clogged with oil and carbon buildup, and it cannot open or close properly.

What does your PCV valve do?

Your car’s PCV valve is a one-way valve attached to the crankcase that holds motor oil and produces gasses when your engine burns fuel. A PCV valve’s main job is to control gas emissions and reroute any gas produced by the crankcase back into your engine’s combustion chambers.

What are the three signs of a bad PCV valve?

What are the signs of a faulty PCV valve?

excessive suction on the oil cap.
a discolouration or film-like residue forming on the underside of the oil cap.
whistling noises coming from the engine.
the emission of white exhaust smoke.

What is the lifespan of a PCV valve?

The lifespan of a PCV valve varies depending on factors like driving conditions and maintenance. On average, they can last anywhere from 20,000 to 50,000 miles. It’s essential to include PCV valve inspection in your regular maintenance routine.

When should I replace my Subaru PCV valve?

Unlike changing your battery or oil, there is no particular time frame to replace your PCV valve. As long as a PCV valve is functioning properly, you do not need to replace it. However, they are subject to damage due to a lot of blow-by gases traveling through them which can sludge the valve up.

Can you drive a car with a bad PCV valve?

The PCV valve is easily one of the most important parts of your car, and although it is possible to continue to operate your car with a bad valve, it is not recommended as it can corrode your car’s engine over time.