X4XZ UF549 Ignition Coil & 9029 Double Iridium Spark Plug Kit — 4-Pack for Nissan/Infiniti, Direct Replacement for Improved Combus

X4XZ UF549 ignition coils paired with 9029 double iridium spark plugs form a direct-replacement kit designed to restore reliable spark and smoother running for supported Nissan and Infiniti engines.

If your vehicle is showing signs of misfires, rough idling, or reduced responsiveness, worn ignition coils and spark plugs are common culprits. This kit bundles four UF549 ignition coil packs with four 9029 double iridium spark plugs so you can replace the items that most influence combustion quality in affected cylinders. Components match or improve on original equipment specifications to simplify installation and deliver consistent electrical performance across a wide range of Nissan and Infiniti models.

Which vehicles are compatible with this coil and spark plug set?

This kit is engineered for specific Nissan and Infiniti models and model years where UF549 and 9029 fitment applies. Always cross-check your vehicle’s year, engine size, and OEM part numbers before purchase to ensure proper fitment.

• Nissan: Altima 07–08 (2.5L), Cube 09–14 (1.8L), March 12–18 (1.6L), NP300/Frontier 16–19 (2.5L), Rogue 08–13 (2.5L), Sentra and Tiida year ranges, Versa and X-Trail models listed.
• Infiniti: FX50 09–13 (5.0L), M56 11–13 (5.6L), Q70/Q70L 14–19 (5.6L), QX60 14–17 (2.5L), QX70 14–17 (5.0L).
• OE references: UF549 (coil) and 9029 (double iridium spark plug) for cross-checking with factory numbers.

How do these ignition coils and double iridium plugs improve performance?

The ignition coils are built with high-grade materials and noise suppression to reliably deliver high voltage to each plug, while the double iridium plugs provide a precise, durable electrode for consistent combustion. Together they reduce misfires, stabilize idle, and help maintain fuel efficiency under normal operating conditions.

• Coils: stainless-steel springs, ferrite noise suppressor, heat-resistant thermoplastic connector for secure fit.
• Plugs: double iridium tips for long life and steady spark across mileage.
• Installation: form-fit design intended to match or exceed OEM dimensions for straightforward replacement.

What should I expect during installation and ongoing maintenance?

Installation is intended to be plug-and-play for compatible vehicles, requiring standard hand tools and basic mechanical knowledge. There is no printed manual in the package, so follow a service manual or reputable online guide for torque values and replacement intervals specific to your engine.

• Package includes: 4 ignition coil packs and 4 double iridium spark plugs — no manual included.
• Recommended: replace coils and plugs in matched sets for consistent cylinder performance.
• Service support: X4XZ offers 24-hour customer service and a three-year product warranty for quality concerns.

Who is this kit for? Drivers and mechanics who own the listed Nissan or Infiniti models and want an affordable, direct-replacement solution for worn ignition components. It suits DIYers replacing coils and spark plugs together, independent shops seeking aftermarket parts that mirror OE fitment, and anyone addressing misfire-related symptoms without changing other engine systems. Always verify engine code and part numbers before ordering to guarantee compatibility.