X4XZ Ignition Coil Pack & Double Iridium Spark Plug Kit — Toyota 1.5L 4-Pack, Direct-Fit Long-Life

The X4XZ UF316 ignition coil pack set with 7090 double iridium spark plugs is a direct-fit replacement kit designed to restore reliable ignition and smoother engine operation for Toyota 1.5L models including Prius, Echo, Scion xA/xB and Yaris.

If your vehicle shows symptoms like rough idle, reduced power, or poor fuel efficiency, worn coils and spark plugs are common causes. This kit combines four UF316 ignition coils and four 7090 double iridium spark plugs engineered to meet or improve on original equipment specifications for fitment, durability and electrical performance. The parts focus on consistent spark delivery and interference suppression to help the engine run more smoothly across a wide temperature range.

How will these parts affect my car's starting and idling?

Replacing degraded ignition coils and spark plugs can noticeably improve cold and warm starts and smooth unstable idle. The double iridium plugs offer a stable, long-lasting electrode while the coils are built to reduce radio frequency interference and maintain high-voltage transfer.

• Restores consistent spark timing for reliable starts
• Reduces misfires that cause rough idle and hesitation
• Improves idle stability after replacement

Are these components compatible with my Toyota or Scion model?

The kit is manufactured for multiple 1.5L Toyota engine applications (Engine ID 1NZFE) and compatible model years are listed to help verify fit. Always cross-check your vehicle’s engine code and compare the coil and plug shapes against the second product image or your factory part numbers before ordering.

• Fits 2001–2009 Toyota Prius L4 1.5L (1NZFE)
• Also fits 2000–2005 Toyota Echo, 2004–2006 Scion xA/xB and later Yaris and Prius C years indicated
• OE references included: UF316 + 7090; replaces several factory numbers

What makes the 7090 double iridium plugs and UF316 coils durable?

Double iridium electrodes offer a fine, wear-resistant tip that keeps spark energy focused and durable over extended service intervals. The coils use premium materials, an internal ferrite suppressor to limit radio noise, and thermoplastic connectors engineered to resist heat cycling and cracking.

• Double iridium plugs rated for long service life and stable spark
• Stainless-steel spring and ferrite noise suppressor inside each coil
• Advanced thermoplastic connectors resist thermal stress and breakage

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

The kit is designed as a direct-replacement set that aligns with original mounting points for straightforward installation by a mechanic or experienced DIYer. The package contains four ignition coil packs and four double iridium spark plugs; basic hand tools and a torque wrench are recommended for correct installation.

• Includes: 4 x UF316 ignition coils and 4 x 7090 double iridium spark plugs
• Designed for fast, bolt-in replacement—no special adapters required
• Manufacturer offers 24-hour customer support and a one-year product warranty

Who is this for: This X4XZ kit suits owners of Toyota and Scion vehicles with the 1NZFE 1.5L engine who want a cost-effective, OE-compatible ignition overhaul. It’s appropriate for drivers experiencing misfires, rough idle, or diminished performance and for routine maintenance where long-life plugs and reliable coils are preferred over single-event repairs. If you’re unsure about fit, confirm your engine code and compare the included OE numbers before purchase.