KacuYelin ignition coil pack and iridium spark plug kit — Set of 4, OEM-fit for Toyota 1.5L

KacuYelin UF316 ignition coil pack paired with four iridium spark plugs is a direct-fit replacement kit designed to restore reliable spark and engine response on compatible Toyota and Scion 1.5L L4 models.

This kit combines engineered ignition coils and long-life iridium spark plugs to replace worn components that cause misfires, rough idle, poor throttle response, and higher fuel use. Engineered to match OEM specs and built in TS16949-certified facilities, the UF316 coil and iridium plugs are a plug-and-play solution for Echo, Prius, Prius C, Yaris, and Scion xA/xB model years listed in the fitment. Below you’ll find concise answers to the most common buyer questions and clear details to help you decide if this kit matches your vehicle and maintenance needs.

Which vehicles and model years does this set fit?

This kit is designed for 1.5L L4 Toyota and Scion models. Confirm fitment by matching year, model, engine size, and submodel before ordering. It is not compatible with Prius V or Prius Plug-In variants.

• 2000–2005 Toyota Echo 1.5L L4
• 2001–2009 Toyota Prius (standard 1.5L L4)
• 2012–2019 Toyota Prius C (1.5L L4) — not for Prius V/Plug-In
• 2006–2018 Toyota Yaris 1.5L L4 (note hatchback vs sedan fitment differences)
• 2004–2006 Scion xA/xB 1.5L L4

What are the technical advantages of the coil pack?

The KacuYelin ignition coil uses high-purity copper windings, a silicon steel core and high-temperature epoxy to maintain stable high-voltage output and resist corrosion. Those materials help reduce ignition-related failures and provide a consistent spark across operating conditions.

• OE-equivalent part numbers: 90080-19021, 90919-02240, UF316
• High-purity copper windings for efficient current transfer
• Silicon steel core and heat-resistant epoxy for durability
• Designed for plug-and-play replacement to match OEM fit

Why choose iridium spark plugs in this kit?

Iridium plugs in the KacuYelin set use a durable center electrode and precision welding to concentrate spark energy, improving ignition stability and longevity compared with standard plugs. They offer resistance to electrode wear and are built with high-alumina ceramic insulators for heat tolerance and insulation.

• 360° continuous laser-welded center electrode for focused spark
• High nickel content and durable materials to resist abrasion
• Long service life typically expected between 60,000–100,000 miles under normal conditions
• Designed to reduce carbon buildup and help maintain steady combustion

How might this kit affect drivability and efficiency?

Replacing aging coils and spark plugs can restore smoother starts, crisper throttle response, and more consistent combustion. While results vary, a well-matched ignition kit may lead to improved fuel economy, fewer misfires, and reduced emissions when installed correctly and paired with routine maintenance.

• May reduce misfires, rough idle, and start-up hesitation
• Can help stabilize fuel combustion and emissions under normal operating conditions
• Direct, OEM-style fit decreases installation time and complexity

Who is this for: The KacuYelin UF316 coil pack and four iridium plug kit is aimed at DIY owners and independent shops working on Toyota Echo, Prius, Prius C, Yaris, or 2004–2006 Scion xA/xB 1.5L models who need a cost-effective, OEM-matching ignition refresh. If your vehicle shows misfire codes, rough idling, or reduced responsiveness and your model appears in the fitment list, this set provides a straightforward, factory-style replacement. Always verify your exact year, model, and engine code in the fitment checker before purchase, and consult a technician if you’re unsure about installation or diagnosis.