Keymall Hyundai Sonata 2018-2019 Keyless Entry Remote Fob — 4-Button 434MHz with 128-bit AES Transponder

Keymall replacement proximity key fob for Hyundai Sonata 2018–2019 is a complete aftermarket keyless remote that includes the 128-bit AES chip, CR2032 battery, uncut emergency key, and four-button remote functions (lock/unlock/trunk/panic).

This Keymall remote is designed as a direct replacement for owners who need a functioning keyless entry fob for Hyundai Sonata model years 2018 and 2019. It matches the original’s button layout and frequency characteristics (434 MHz) and arrives with a factory-installed Texas Crypto 8A 128-bit AES transponder chip and CR2032 battery. The item is aftermarket and ships without manufacturer logos or printed part numbers on the housing.

How do I know this fob fits my Sonata?

Compatibility depends on matching the original remote’s physical shape, button configuration, FCC ID, or part number. This Keymall unit is intended for Sonatas that originally used FCC ID CQOFD00120 or part numbers like 95440-C1500 / 95440-C1500NNA / 95440-C2500.

• Check your original remote’s FCC ID or printed part number.
• Confirm the button count and layout (Lock, Unlock, Trunk, Panic).
• Match the emergency key blank shape with 81996-3Z020 or 81999-2S040.
• Ensure your vehicle uses 434 MHz proximity/keyless GO systems.

What steps are required to install and use this replacement remote?

Installation requires professional key cutting and electronic programming; the remote ships with an uncut emergency key and pre-installed electronics but will not operate until programmed to your vehicle. Keymall does not provide programming or cutting, so plan a visit to an authorized locksmith or dealer.

• Have the emergency key blade cut to match your vehicle’s lock.
• Have a certified locksmith or dealer program the transponder and remote functions.
• Verify all four buttons (lock/unlock/trunk/panic) work after programming.
• Keep your original remote until the replacement is fully verified.

What technical specs and safeguards should I be aware of?

This Keymall remote includes a secure Texas Crypto 8A transponder with AES 128-bit encryption and operates at 434 MHz. Because it’s an aftermarket product, the housing lacks branded markings; nevertheless, it ships complete with battery, chip, and circuit board.

• Chip: 8A Texas Crypto, 128-bit AES encryption for security.
• Battery: standard CR2032 installed and ready to program.
• Frequency: 434 MHz, compatible with listed Sonata systems.
• Package: remote fob plus uncut emergency key; no logo on housing.

Will this remote work in the USA and Canada?

Yes—this replacement is intended for the North American market, but regional differences in keyless systems can occur. Confirm your vehicle’s original remote identifiers and system type before purchase.

• Region/market: USA & Canada compatible units.
• Intended vehicles: Hyundai Sonata model years 2018 and 2019.
• Aftermarket note: housing has no OEM logo or part number.
• Professional programming and key cutting are required post-purchase.

Who this item is for: Owners of Hyundai Sonata 2018–2019 who need a complete aftermarket replacement key fob with secure transponder technology and a ready-installed battery, and who are prepared to have the key blade cut and the remote professionally programmed. This product suits people replacing lost or damaged remotes when they can confirm matching FCC ID/part number and the four-button layout. Avoid ordering if your original remote’s shape, blade, or button arrangement differs; compare your existing remote carefully before purchase.