Spark plug seal set Honda genuine 12342-P08-004

Spark Plug Seal Set Honda 12342-P08-004 – Genuine Plug Tube Seals

The Honda spark plug seal set 12342-P08-004 is a genuine set of spark plug tube seals mounted in the valve cover. They seal the spark plug wells (plug tubes) and prevent engine oil from entering the spark plug holes. A worn or hardened seal set can cause oil on the spark plugs, misfires and damage to ignition components – especially on older D-series and other petrol Honda engines.

OEM numbers – replaces these Honda references

This genuine Honda seal kit replaces the following OEM part numbers:

• 12342-P08-004 – main reference number
• 12342-RYE-004
• 12342-P2F-A01
• 12342-P8A-A01
• 12342-P2A-005

If any of these part numbers appear in your Honda parts catalog or on the original parts list for your engine, this kit is the correct genuine replacement. All references listed above point to the same spark plug tube seal set 12342-P08-004.

Application – compatible Honda models and engines

The seal set 12342-P08-004 fits a wide range of petrol Honda engines, including popular D-series, K-series and J-series units. Typical applications include:

• Honda Accord 1999–2001 – engines: D16B6, F18B2, F20B6, F23Z5
• Honda Accord 2009–2015 – engine: K24Z3
• Honda Civic 1992–2005 (D-series) – engines: D14A3, D14A4, D14A7, D14A8, D14Z3, D14Z4, D14Z6, D15Z1, D15Z3, D15Z6, D15Z8, D16Z6, D16Z9, D16Y5, D16Y7, D16Y2, D16Y6, D16Y8, D16B2, D16W3, D16W4, D16W7, D16V1, D17A8, D17A9
• Honda CRX 1992–1997 – engines: D16Z6, D16Y8
• Honda Civic Hybrid 2006–2011 – engine: LDA2
• Honda FR-V 2005–2006 – engine: D17A2
• Honda HR-V 1999–2005 – engines: D16W2, D16W4
• Honda Legend 2007–2010 – engine: J35A8
• Honda Logo 1999–2000 – engine: D13B7
• Honda Shuttle 1998–1999 – engine: F23A7
• Honda Stream 2001–2005 – engine: D17A2

If you are unsure whether this kit fits your car, send us your VIN and we will confirm compatibility using Honda’s parts catalog.

Why it is worth replacing the spark plug tube seals

• Prevents engine oil leaking into spark plug wells and onto ignition coils.
• Helps avoid misfires, rough running and damage to plug boots or coil packs.
• Ensures a clean, dry area around the spark plugs – important on high-mileage D-series engines.
• Recommended whenever the valve cover gasket is replaced or the valve cover is removed.

This is a complete seal set for all spark plug tubes on one engine – ideal for a thorough service together with a new valve cover gasket and fresh spark plugs.

Installation notes

• Work on a cold engine and carefully remove the valve cover.
• Press the old plug tube seals out of the cover and clean the grooves from old rubber and sealant.
• Lightly oil the new seals and press them in evenly so they sit flat and fully seated in the valve cover.
• When refitting the valve cover, follow Honda torque specs for the cover bolts to avoid warping or leaks.

If you do not have experience with valve cover work, we recommend having the job done by a professional mechanic – especially on newer K-series and J-series engines where access is tighter.

FAQ – spark plug seal set Honda 12342-P08-004

Is this a genuine Honda part or aftermarket?
This kit consists of genuine Honda spark plug tube seals, supplied as an original replacement part.

Does the set include all seals for one engine?
Yes, it is a complete set of spark plug tube seals for one cylinder head – all plug wells that require sealing are covered by this kit.

I have part number 12342-RYE-004 / 12342-P2A-005 in my catalog. Is this the correct kit?
Yes. These numbers are superseded Honda references to the same spark plug seal set and are replaced by 12342-P08-004.

When should I replace these plug seals?
Whenever you notice oil in the spark plug wells, during a valve cover gasket replacement, or as preventive maintenance on high-mileage Honda engines – especially older Civics, CRX and HR-V.