Honda K20A2/K20A3/K20Z1 PCV Valve 17130-PRB-A01

Genuine Honda K-Series PCV Valve (17130-PRB-A01)

The PCV valve is a cheap part that causes expensive-looking problems when it fails. It controls crankcase ventilation, routing blow-by gases back into the intake to be burned, and when it sticks, you get rough idle, oil leaks from seals and gaskets, and oil consumption that sends people chasing much bigger repairs. This is the genuine Honda replacement for the K-series, the correct valve to fix those symptoms or to refresh as routine maintenance.

What The PCV Valve Does, And Why A Stuck One Causes Trouble

Worth understanding, because PCV problems are commonly misdiagnosed.

As your engine runs, a small amount of combustion pressure slips past the rings into the crankcase, that's blow-by. The PCV (positive crankcase ventilation) system vents those gases out of the crankcase and routes them back into the intake to be burned, which keeps crankcase pressure controlled and keeps moisture and contaminants from building up in your oil.

The PCV valve regulates that flow, and it's a one-way valve that can stick over time. When it does, it causes problems in both directions:

Stuck closed traps pressure in the crankcase, which pushes oil past seals and gaskets, you get oil leaks (often blamed on the valve cover or main seals), and a rough idle.

Stuck open creates a vacuum leak, which causes a rough or unstable idle and lets excess oil vapor get pulled into the intake, showing up as oil consumption and fouling.

People chase these symptoms through seals, gaskets, and sensors when a stuck PCV valve is the cheap, common cause. If you've got unexplained oil leaks, oil consumption, or a rough idle on a K-series, this valve is one of the first things to check and replace.

It Protects The Engine And Keeps It Legal

Two functions worth knowing.

Beyond the symptoms, a working PCV system protects your engine by keeping the crankcase properly ventilated, which prevents the oil contamination and sludge that build up when blow-by gases and moisture aren't vented. Clean, properly ventilated oil lasts longer and protects the engine better.

It's also an emissions component, the PCV system is what keeps crankcase gases from venting to atmosphere, so a functioning valve keeps the car compliant with emissions regulations. A fresh genuine valve handles both.

Cheap Maintenance Worth Doing

The practical case for this part.

A PCV valve is inexpensive and simple to replace, and it's a wear item that's worth refreshing periodically, especially on a higher-mileage K-series where the original has been cycling for years. Given how cheap it is and how annoying the symptoms of a stuck one are to diagnose, replacing it as routine maintenance is easy insurance.

Use the genuine Honda valve, since a PCV valve's calibrated flow is its whole function, and a cheap aftermarket one that flows incorrectly can cause the same idle and oil problems it's meant to prevent.

Fitment

2002-2006 Acura RSX Type S (K20A2 / K20Z1)
2002-2005 Honda Civic Si (K20A3)

Covers K20A2, K20Z1, and K20A3. Part number 17130-PRB-A01. Genuine Honda.

Who Should Grab One

This is for the RSX Type S or Civic Si owner chasing an oil leak, oil consumption, or rough idle, often a stuck PCV valve, and for anyone doing routine maintenance on a higher-mileage K-series. Genuine Honda, cheap, and the correct fix for a part that causes bigger-looking problems when it fails. Swap it in, rule out the PCV, and keep the crankcase breathing right.

Fits: 2002-2006 Acura RSX Type S (K20A2/K20Z1), 2002-2005 Honda Civic Si (K20A3). Part number: 17130-PRB-A01. Function: regulates crankcase ventilation (PCV), protects the oil and engine, maintains emissions compliance. Type: genuine Honda. Note: a cheap maintenance item worth replacing periodically; a stuck valve causes oil leaks, oil consumption, or rough idle. Sold: individually.