Honda OEM Automatic Transmission Drain Plug Washer 90471-PX4-000

Genuine Honda drain plug washer 90471-PX4-000 is a small but essential component that ensures a perfect seal of the automatic transmission drain bolt. Used across a wide range of Honda and Acura vehicles equipped with traditional automatic gearboxes (AT), this 18 mm aluminum washer prevents fluid leaks and protects the integrity of the transmission case threads.

Manufactured to Honda OEM specifications, the washer provides the correct thickness and compression characteristics when the bolt is torqued. It should always be replaced during every ATF change — reusing an old washer can lead to micro-leaks and gradual fluid loss.

Product Details

• OEM Part Number: 90471-PX4-000
• Inner Diameter: 18 mm
• Material: aluminum (controlled hardness, crush-type sealing)
• Application: automatic transmissions (AT only)
• Packaging: bulk pack of 10 pcs – sold individually, without OEM bag

Compatibility – Honda and Acura Models

This washer fits most Honda and Acura automatic transmissions from the 1990s through today, including:

• Honda Accord (1990–2025 – sedan, coupe, Tourer, Aerodeck, E:HEV)
• Honda Civic (1993–2025 – all body styles, excluding Type-R manual versions)
• Honda CR-V (1997–2025 – gasoline and diesel AT, Hybrid E:HEV / E:PHEV variants)
• Honda HR-V (1999–2026 – E:HEV hybrid included)
• Honda Jazz / Fit (2002–2025 – hybrid and standard AT versions, not CVT)
• Honda Legend, Prelude, Odyssey, Pilot, Stream, FR-V, Shuttle, Insight, ZR-V
• Acura – TL, RL, MDX, RDX, TLX, Integra, NSX (AT models only)

Note: not used in CVT transmissions or manual gearboxes. To confirm fitment, check your vehicle’s VIN or OEM service manual.

Why Replace the Washer During Every ATF Change?

• Leak prevention: ensures tight sealing of the drain bolt after each service.
• Thread protection: allows correct torque without damaging the aluminum transmission case.
• Corrosion resistance: prevents galvanic binding between bolt and case.
• Low cost – high benefit: cheap insurance against expensive repairs caused by ATF loss.

FAQ – Honda 90471-PX4-000 Drain Plug Washer

1) Is this washer used on CVT or manual transmissions?
No – it’s designed exclusively for conventional automatic transmissions (AT). Manual and CVT gearboxes use washers of different size and material.

2) Can the washer be reused?
No. Being a crush-type aluminum washer, it permanently deforms when tightened and should be replaced every time the bolt is removed.

3) Does this fit hybrid or diesel models?
Yes – if they use a hydraulic automatic transmission. It does not apply to e-CVT systems used in some hybrids.

4) Is this a genuine Honda part?
Yes – made to Honda OEM specifications. Bulk packaging may not include individual Honda labeling, but part geometry and material are identical to factory supply.

5) How often should it be replaced?
With every automatic transmission fluid (ATF) service – typically every 40 000–60 000 km.

Honda OEM washer 90471-PX4-000 – a simple, inexpensive part that guarantees a leak-free ATF service and long-term transmission reliability.