X4XZ ignition coil & double iridium spark plug 6-piece kit — OE-fit for Nissan/Infiniti V6, long-life

X4XZ UF401 ignition coil and 4469 double iridium spark plug 6-piece kit replaces OE# 22448-AL61C to restore reliable starts, smooth idle, and consistent combustion for compatible Nissan and Infiniti V6 engines.

This complete 6-coil and 6-plug set is built to match or exceed OE fit and function for many 3.5L and 4.0L Nissan and Infiniti applications. Each coil uses reinforced thermoplastic housings, stainless-steel springs, and internal ferrite noise suppression for stable high-voltage delivery; the double iridium plugs deliver a fine, durable spark electrode for extended service life. The kit ships with ignition coil packs x6 and double iridium spark plugs x6, and is intended as a direct-replacement service kit for owners performing scheduled maintenance or addressing ignition-related drivability issues.

Which vehicles are compatible with this X4XZ UF401 and 4469 kit?

This kit covers a broad list of Nissan and Infiniti V6 models across early 2000s through late 2010s. Compatibility includes many Altima, Maxima, Pathfinder, Quest, 350Z, Frontier, NV-series, Xterra, FX35, I35, QX4, G35 and M35 model years; always verify fitment against your VIN or the second product image before purchase.

• Nissan: Altima (02–06 3.5L), Maxima (02–08 3.5L), Pathfinder (02–04 3.5L; 05–12 4.0L), 350Z (03–06 3.5L).
• Also for Quest (04–09), Frontier (05–19 4.0L), NV1500/2500/3500 (12–19 4.0L), Xterra (05–15).
• Infiniti: FX35 (03–08), I35 (02–05), QX4 (02–03), G35 (03–07), M35 (06–08).

How do the ignition coils and double iridium plugs improve engine performance?

These components are engineered to restore consistent spark timing and strength, which helps reduce misfires and rough idling that occur with worn coils or plugs. The double iridium electrode offers long-lasting spark stability, while the coil’s noise suppressor and durable materials maintain voltage integrity under heat and vibration.

• Double iridium plugs for extended service life — up to approximately 100,000 km under normal use.
• Ferrite suppressor in each coil to reduce radio-frequency interference and electrical noise.
• Reinforced connector and stainless-steel spring for reliable high-voltage transfer.

What are the installation and part-number details I should know?

Each kit contains six ignition coils and six spark plugs sized for direct OE replacement; no manual is included but the design mirrors factory geometry for straightforward swap-in installation. The package lists OE and replacement numbers to confirm compatibility with your vehicle’s parts catalog.

• Included: Ignition Coil Packs x6, Double Iridium Spark Plug x6.
• OE/replace numbers: UF401, 4469, and cross-references like 22448-AL61C, NGK4469, and other common aftermarket codes.
• Designed for bolt-in replacement; basic hand tools or a spark-plug socket and torque wrench are typically required.

What warranty and support are available after purchase?

X4XZ provides customer support and a one-year product service period to address installation questions or quality concerns. If you encounter fitment or functional issues, contact the seller’s support line for troubleshooting, replacement, or further assistance.

• One-year product service from X4XZ.
• 24-hour customer service for installation or quality inquiries.
• Return or replacement handled per seller warranty terms.

Who is this kit for? This 6-piece ignition coil and double iridium spark plug kit is intended for DIY mechanics, professional technicians, and vehicle owners who need a full ignition-service replacement for specified Nissan and Infiniti V6 engines. Choose this set when addressing recurring misfires, rough idle, reduced throttle response, or when performing preventive maintenance to restore ignition reliability and prolong engine component life.