USARemote Infiniti Q50 4-Button Key Fob Replacement KR5S180144203 — Complete Assembly with Electronics & Battery

USARemote’s complete 4-button Infiniti Q50 key fob (KR5S180144203) is a ready-to-program replacement that arrives with electronics and a battery, restoring remote functions after a lost or damaged original.

If your Infiniti Q50 remote is cracked, unresponsive, or missing, this USARemote replacement provides the full fob assembly—including internal electronics and a preinstalled battery—so you can have like-for-like functionality after professional programming. It accepts the same FCC ID (KR5S180144203) and fits the factory P/N variations listed, but the metal key blade must be cut to match your vehicle and the unit requires dealer or locksmith programming to pair with your car.

Will this fob physically match my Infiniti Q50?

This replacement is manufactured to match the original Infiniti 4-button style and layout so it fits the same spaces and feels familiar in hand. Button icons, housing contours, and the emergency key slot mirror OEM design for seamless swap-in.

• Compatible with FCC ID KR5S180144203
• Replaces part numbers 285E3-4HD0C, 285E3-4HD23, 285E34HD0C, 285E3-4HD0A
• Includes preinstalled electronics and battery for immediate use after programming
• Housing and button layout match original Infiniti Q50 fob

What installation steps are required to get it working?

The fob ships ready internally but requires a few vehicle-specific steps before it can control doors or engine start. First, have a locksmith or dealership cut the metal key blade to your car’s key code; then request professional programming to sync remote functions and immobilizer features.

• Cut key insert to match your vehicle prior to use
• Bring the fob and vehicle to a dealer or qualified locksmith for programming
• No DIY pairing—professional tools and access to vehicle systems are required
• Confirm remote and immobilizer programming after pairing

Which parts and electronics are included with this replacement?

This listing is a complete key fob assembly: you receive the outer shell, the internal circuit board, buttons, and a battery already installed so the unit is ready for professional pairing. You won’t need to transfer parts from your old fob, but you will need to provide vehicle-specific cutting and programming services.

• Complete fob with internal electronics and battery included
• No need to salvage components from an old remote
• Battery installed to allow immediate diagnostics during programming
• Requires key blade cutting and professional pairing to vehicle

How durable and reliable is this replacement compared to OEM?

USARemote builds this replacement to meet the fit and function of the original Infiniti remote, using durable materials and standard electronic components. While the housing and circuitry are designed for long-term service, proper programming and a correctly cut key blade are essential for full reliability.

• Sturdy housing designed to withstand daily use
• Preinstalled battery reduces handling and installation steps
• Functionality depends on correct professional programming
• Designed specifically for Infiniti Q50 remote specifications

Who is this for: This USARemote fob is intended for Infiniti Q50 owners or auto professionals who need a complete replacement remote (FCC ID KR5S180144203) that eliminates the hassle of transferring electronics. It’s ideal if your original fob is broken, water-damaged, or lost and you want a full assembly ready for locksmith or dealer programming—note that you’ll still need the key blade cut and a dealer/locksmith to program the unit to your car.