Parts for your 2004 Honda Elysion-Transmission filter

2004 Honda Elysion transmission filter — what’s fitted and how to look after it

Based on Honda technical sources, the 2004 Honda Elysion (chassis RR1/RR2, 5‑speed automatic) does use a transmission filter. Honda’s Electronic Parts Catalogue for the Elysion lists an external “Filter Assy., ATF” (commonly referenced as part no. 25430-PLR-003) fitted in the auto trans fluid return line, along with an internal, non-serviceable pickup strainer inside the transmission. This arrangement mirrors the contemporary Accord/Odyssey 5‑speed autos. Honda service literature also notes that the internal strainer isn’t a routine service item, while the external ATF filter can be replaced when required.

On the Elysion, the transmission filter’s job is to keep the ATF clean by trapping clutch material and fine metal wear before it reaches delicate valves, solenoids and bearings. Clean fluid and a healthy filter help the gearbox shift smoothly, reduce shudder, and extend the life of the pump and valve body — especially important for family hauling, hilly drives and hot Aussie and Kiwi summers.

Unlike many autos with a removable sump and pan filter, this Honda uses an inline ATF filter plus a permanent internal strainer. That means routine servicing focuses on fluid condition and replacing the external filter when there’s evidence of contamination or after heavy use. Honda’s maintenance schedules typically don’t mandate a fixed interval for the ATF filter, but in local conditions it’s sensible to:

• Replace the external ATF filter when the fluid has been overheated/burnt, after transmission repairs, or if shift quality issues persist post fluid change.
• Consider preventive replacement around 100,000–120,000 km, or earlier for towing, stop–start city driving, or steep terrain.
• Use Honda ATF DW‑1 (supersedes ATF‑Z1). Avoid universal fluids unless they explicitly meet Honda DW‑1 requirements.

Good practice during a service is a drain‑and‑fill (about 3 litres per drain), not a power flush. Clean the magnetic drain plug, fit a new crush washer, and cycle the shifter through all ranges to purge air. When replacing the ATF filter, note the flow direction arrow, replace any sealing washers/O‑rings, and check the cooler lines for leaks. A blocked filter can show up as delayed engagement, flare on upshifts, or harsh shifts, so if those symptoms appear, don’t ignore them — an affordable filter and fresh DW‑1 can save a much bigger bill.

Technical references consulted: Honda Elysion (RR1/RR2) Electronic Parts Catalogue — Automatic Transmission section (lists “Filter Assy., ATF” 25430‑PLR‑003), Honda 5‑speed automatic service information noting the internal strainer as non‑serviceable and the external ATF filter as a replaceable in‑line component, plus contemporary Honda ServiceNews guidance on ATF DW‑1 usage and drain‑and‑fill procedures.

Popular questions

Does the 2004 Honda Elysion have a replaceable transmission filter?
Yes. It uses an external in‑line ATF filter on the cooler return line, while the internal strainer inside the transmission isn’t a service item. The external filter commonly cross‑references to Honda 25430‑PLR‑003, but always confirm by VIN.

How often should the ATF and filter be changed?
ATF changes by drain‑and‑fill every 40,000–60,000 km in severe use (towing, heat, city traffic) keep things happy, lighter use can stretch longer if the fluid stays clean and red. The external filter isn’t on a fixed schedule, but many techs replace it at 100,000–120,000 km or whenever fluid is burnt/dirty or after transmission work.

What transmission fluid does it take?
Use Honda ATF DW‑1. It supersedes the older Z1 fluid and is backward compatible. Plan on roughly 3 litres for a single drain‑and‑fill, repeat over a few services if you want a higher overall refresh without flushing.