X4XZ Ignition Coil & Spark Plug Kit for Hyundai Elantra 2.0L — 4-Pack UF816 with Double-Iridium 9723, Long-Life

This X4XZ kit pairs four UF816 ignition coils with four 9723 double-iridium spark plugs to restore reliable starts and smoother running for compatible 2.0L Hyundai and Kia engines.

If your vehicle shows signs of misfires, rough idle, or reduced power, worn coils and plugs are often the cause. The X4XZ UF816 & 9723 kit replaces the factory units with parts designed to match or exceed OE specifications, offering long-lasting spark stability, low electrical interference, and easier installation for common Hyundai and Kia 2.0L models.

Which vehicles will this ignition coil and spark plug kit fit?

The kit is manufactured for a range of Hyundai and Kia models equipped with 2.0L engines. Confirm fitment against your VIN or engine code before purchase to ensure compatibility.

• Hyundai: Elantra (2017–2020), Kona (2018–2022), Sonata Hybrid (2016–2019), Veloster (2019–2021).
• Kia: Forte (2017–2022), Optima Hybrid (2017–2018), Soul (2020–2022), Seltos (2021–2022), Forte5 (2021–2022).
• Check the second main product image for additional vehicles listed.

How do the UF816 coils and double-iridium 9723 plugs improve engine performance?

These components are engineered to deliver consistent, high-energy sparks and reduce electrical noise, which helps the engine fire cleanly and run more smoothly. The double-iridium electrodes extend service life compared with conventional plugs, while the coil’s design enhances voltage transfer under heat and vibration.

• Longer plug lifespan: double iridium construction for extended intervals (up to 100,000 km under ideal conditions).
• Stable ignition: stainless-steel spring and internal ferrite suppressors reduce radio-frequency interference.
• Durable connectors: thermoplastic coil housings resist heat-related cracking and ensure a secure fit.

What comes in the box and what OE references does it replace?

The kit ships with four ignition coil packs and four double-iridium spark plugs—enough for a single 4-cylinder ignition change. It references common OE numbers to simplify cross-referencing and replacement.

• Included: 4 x UF816 ignition coils, 4 x 9723 double-iridium spark plugs.
• OEM/replaceable references: 273002E601, 27300-2E601, UF-816, GN10877, LKR7DIX-11S, and others.
• Note: no printed manual included; basic installation is straightforward for experienced DIYers or mechanics.

How reliable is the kit and what support does X4XZ provide after purchase?

Components are produced to meet or improve on factory designs, using corrosion-resistant and noise-suppressing materials to maintain reliable ignition over many cycles. X4XZ backs the product with customer support and a limited service warranty to address fitment or quality concerns.

• Materials chosen to reduce radio interference and withstand thermal cycling.
• Manufacturer support: 24-hour customer service and a one-year product service policy.
• If installation or part issues occur, contact X4XZ customer service for assistance.

Who is this for: this kit is intended for owners and technicians working on Hyundai and Kia 2.0L engines who need a direct replacement ignition coil and plug set. It’s suitable for DIYers comfortable with basic engine work and professional shops looking for cost-effective, OE-referenced parts that prioritize longevity and quieter electrical operation.