Automatic Transmission Filter Honda 25420-5Y4-003 – e:HEV / Hybrid

Honda Transmission / Hybrid Drive Unit Filter 25420-5Y4-003 – Genuine Honda Part

The genuine Honda transmission / drive unit filter 25420-5Y4-003 is used in selected Honda Hybrid and e:HEV applications fitted with dedicated Honda drive units (commonly referenced as MGAE, MTBE, MTAE, MZFE and CERE/CEGE). Its role is to keep the transmission fluid clean and protect precision hydraulic passages and internal components from wear caused by debris and contamination.

Important: depending on the exact model, market and transmission/drive unit variant, Honda may specify either HEVF TYPE-1 (Hybrid Electric Vehicle Fluid) or a conventional ATF for the transmission side of the system. This means the filter is not “HEVF-only” – it can also be found in applications where the correct service fluid is ATF. Always confirm fitment by OEM part number and VIN (Honda EPC / parts catalogue).

Applications / Compatibility

This filter is commonly listed for:

• Honda Civic 4D e:HEV – non-EU markets
• Honda Civic 5D e:HEV (2023–2026) – Engine: LFC1, Drive unit/Transmission: MGAE
• Honda CR-V e:HEV (2021–2023) – Engine: LFB1, Drive unit/Transmission: MTBE / MTAE
• Honda CR-V Hybrid (2019–2020) – Engine: LFB1, Drive unit/Transmission: MTBE / MTAE
• Honda Prelude (2026–) – Engine: LFC1, Drive unit/Transmission: MZFE
• Honda ZR-V e:HEV (2023–2026) – Engine: LFB17, Drive unit/Transmission: CERE / CEGE

The list above is for guidance only (specifications may vary by market/year). If you have a customer’s CR-V Hybrid where the service fill is ATF, this part number may still be correct – the decisive factor is VIN verification.

OEM Reference Number

Honda OEM: 25420-5Y4-003
OEM numbers are provided as reference identifiers to confirm correct fitment.

Why This Filter Matters

• keeps the transmission fluid clean (HEVF or ATF – depending on the application),
• helps protect hydraulic circuits and small oil passages from contamination,
• supports stable operation under the variable load typical for hybrid drivetrains,
• reduces the risk of premature wear of internal components,
• genuine Honda part for correct fit and specification.

When to Replace / Wear Symptoms

Replacement interval depends on the model, market and service schedule. In practice, it is recommended to replace the filter:

• during transmission fluid service (HEVF or ATF as specified for the vehicle),
• after transmission-related repairs or if fluid contamination is suspected,
• on higher mileage vehicles and in heavy city use,
• if operation changes noticeably (feel, response, abnormal behaviour – depending on the design).

Installation Notes

• Confirm fitment by VIN and the OEM part number – hybrid models may have different variants.
• Use only the fluid specified for the exact vehicle (HEVF or ATF) and keep the work area clean during service.
• After installation, verify for leaks and confirm the fluid level following the correct Honda procedure (temperature/inspection mode may apply).

FAQ – Honda Transmission / Hybrid Drive Unit Filter 25420-5Y4-003

Is this filter only for HEVF TYPE-1?
No. Depending on the model and market, the same filter can be used in applications filled with HEVF or with ATF. Always verify by VIN and OEM part number.

Can I choose this filter just by selecting “CR-V Hybrid”?
It’s better to confirm using VIN, because specifications can differ by year and market.

Should the filter be replaced together with the transmission fluid?
Yes – that’s typically the best time to replace it, since the system is already being serviced and i