X4XZ UF316 Ignition Coil Pack with 7090 Double Iridium Spark Plugs for Toyota Prius 1.5L — 4-Coil 4-Plug Kit, OE Fit & Long-Life

X4XZ UF316 ignition coil pack with 7090 double iridium spark plugs is a direct-replacement kit engineered to restore reliable ignition, smoother idling, and improved throttle response for select Toyota and Scion 1.5L engines.

This kit combines four ignition coils and four double-iridium spark plugs designed to meet or exceed original equipment specifications for Toyota Prius, Prius C, Scion xA/xB, Echo and Yaris 1.5L models using the 1NZ-FE engine family. Each coil and plug is built from corrosion‑resistant materials and engineered for easier installation so you can address misfires, rough idle, or diminished performance with a single, matched set.

How does this kit improve engine starting and idle?

The coils deliver consistent high-voltage to each plug while the double-iridium electrodes provide a stable, long-lasting spark. Together they reduce ignition inconsistencies that cause hard starts and uneven idling, translating to a smoother-running engine.

• Matched coil-to-plug set for balanced firing across cylinders
• Double-iridium plugs rated for extended life and stable arcs
• Internal ferrite noise suppressor minimizes electrical interference
• Thermoplastic connectors resist heat-related cracking

Will these parts fit my vehicle and replace OEM numbers?

The X4XZ UF316 + 7090 kit is compatible with many vehicles that use the 1NZ-FE 1.5L engine. It is intended as a direct replacement for OE part numbers such as C1304, 90080-19021, 90919-02240, and 90919-02265, but always verify fitment for your year and model before purchase.

• Fits 2001–2009 Toyota Prius (1NZ-FE models) and 2012–2019 Prius C
• Compatible with 2004–2006 Scion xA/xB and 2007–2018 Toyota Yaris
• Works for 2000–2005 Toyota Echo models with 1NZ-FE
• Check the second product image or your OEM number to confirm compatibility

How durable are the ignition coils and iridium plugs?

Both components are produced from materials selected for longevity and thermal resistance. The iridium plugs are engineered for extended service life, while the coils use internal suppressors and robust connectors to withstand heat and vibration in daily driving conditions.

• Double-iridium tips for consistent performance up to long service intervals
• Stainless-steel spring and ferrite noise filter inside the coil
• Heat-resistant thermoplastic coil housing to reduce connector failures
• Manufactured to match or improve on OE design and fit

How easy is installation and what’s included in the package?

This kit is supplied as a four-coil and four-plug set to simplify replacement of all ignition circuits at once. Installation typically follows the factory service procedure: remove old coils and plugs, install new plugs to correct gap and torque, then attach new coils. No printed manual is included, so a repair guide or OEM torque specs are recommended.

• Package contains 4 ignition coil packs and 4 double-iridium spark plugs
• Designed for bolt-in replacement with OE-style connectors and seals
• No paper manual—consult vehicle repair manual or online guide
• One-year product support and 24-hour customer service from X4XZ

Who is this for: The X4XZ UF316 + 7090 kit is aimed at DIY mechanics, independent shops, and owners of Toyota/Scion 1.5L (1NZ-FE) vehicles who need a matched ignition solution to remedy misfires, harsh idle, poor throttle response, or routine tune-up replacement. It’s especially useful when replacing all coils and plugs together to restore even cylinder performance and avoid repeated labor for single-bank repairs.