Staff Answer
Jun 18, 2026 - 04:51 PM
This is the genuine OEM Infiniti M35/M45 smart proximity key (part number 285E3-EH12A, FCC ID CWTWBU735), made for the 2007–2010 Infiniti M35 and M45. It is the Infiniti M-series Intelligent Key — the style designed to insert into the key slot on the dash of those vehicles — not a separate Nissan-only fob.
Here's what usually causes the Infiniti-versus-Nissan confusion: Infiniti is Nissan's luxury division, so every Infiniti key is technically an OEM Nissan-manufactured part, and some listings show "Nissan" as the manufacturer even when it is the correct Infiniti key. The brand label is not what determines fit. What matters is the part number (285E3-EH12A) and the FCC ID (CWTWBU735).
For that reason, check the FCC ID printed on the back of your current key before ordering. The M35/M45 was produced with two different FCC IDs over its run — CWTWBU618 on earlier units and CWTWBU735 on later ones — and the two are not always interchangeable. This listing is the CWTWBU735 version. Matching the FCC ID and part number to your existing key is the surest way to confirm you'll receive the correct slot-in fob.
If you're not 100% certain, KEY4 offers a free compatibility check — send your VIN or your current key's part number and FCC ID and we'll confirm the match. The key still needs to be cut and programmed to your vehicle by a professional automotive locksmith or an Infiniti dealer, as KEY4 supplies the part only and does not provide programming or cutting services.
