PRODUCT DETAILS
Genuine Honda VTEC Spool Valve Filter / Gasket (15815-R40-A01) - K24Z
If your K24 is throwing a VTEC-related code, leaking oil from the spool valve, or you're chasing an oil pressure issue, this cheap part is a common culprit. The spool valve filter and gasket sit behind the VTEC oil pressure switch (the spool valve) on K24Z engines, and the gasket hardens with age until it leaks or lets oil pressure drop, which trips the VTEC system. This is the genuine Honda replacement, the correct part to fix it and the right thing to refresh any time the spool valve assembly comes off.
What This Part Does, And Why It Fails
Worth understanding, because it's a frequently misdiagnosed problem on these engines.
The K24's VTEC system is controlled by a spool valve (the VTEC solenoid / oil pressure switch) bolted to the head, and it relies on oil pressure to engage VTEC. Behind it sits a small filter and gasket, the filter keeps debris out of the spool valve, and the gasket seals it to the head.
Over years and heat cycles, that gasket hardens and shrinks until it stops sealing. When it does, you get an oil leak at the spool valve, and more importantly, a loss of oil pressure to the VTEC system, which can trip a check engine light and a VTEC-related code. People sometimes chase the solenoid itself or deeper problems when a hardened gasket is the actual, cheap cause. If you've got a leak at the spool valve or a VTEC code on a K24, this is one of the first things to check and replace.
Replace It Whenever The Spool Valve Comes Off
The practical rule for this part.
Any time you remove the VTEC spool valve, to clean it, replace the solenoid, or chase a leak, replace this filter and gasket rather than reusing them. An old hardened gasket won't re-seal reliably once disturbed, and the filter is cheap enough that fresh is the only sensible choice while you're in there. It's a few dollars of insurance on a job you don't want to redo.
Fits The K24Z Engines
Worth being clear on fitment, since it's engine-specific.
The R40 in the part number signifies the K24Z family, including the K24Z3 and K24Z7. Go by your engine to confirm, these are the K24Z-equipped Accord, TSX, Civic Si, CR-V, ILX, and Crosstour of the 2008-2015 era. If you're running one of those, this is your part.
Use The Genuine Part
On a sealing gasket, correct material and fit are the entire job. The genuine Honda part is made to the right dimensions from material that holds up to engine heat and oil, so it seals properly and lasts, where a cheap aftermarket gasket can harden and leak again, putting you back to chasing the same VTEC code. At this price, genuine is the obvious call.
Fitment
2008-2012 Honda Accord (K24)
2012-2015 Honda Civic Si
2010-2014 Honda CR-V
2012-2015 Honda Crosstour
2009-2014 Acura TSX (K24)
2013-2015 Acura ILX
K24Z engines (K24Z3, K24Z7). Part number 15815-R40-A01. Genuine Honda.
Who Should Grab This
This is for the K24 owner chasing a VTEC code, an oil leak at the spool valve, or an oil pressure issue, and for anyone who has the spool valve off for other work and should refresh the filter and gasket while they're there. Genuine Honda, cheap, and the correct fix for a problem that looks worse than it is. Swap it in, reseal the spool valve, and clear the code for good.
Fits: 2008-2012 Accord, 2012-2015 Civic Si, 2010-2014 CR-V, 2012-2015 Crosstour, 2009-2014 Acura TSX, 2013-2015 Acura ILX (K24Z engines). Part number: 15815-R40-A01. Function: filters and seals the VTEC spool valve (oil pressure switch) to the head. Fixes: spool valve oil leak, VTEC code, oil pressure loss from a hardened gasket. Type: genuine Honda. Note: replace whenever the spool valve is removed.
2013-2015 Acura ILX