UF550 Ignition Coil Pack and 1406 Spark Plugs Set of 6 - Reliable V6

In this review of the UF550 coil pack and 1406 spark plug kit, the bottom line is simple: this set is for V6 Nissan and Infiniti owners who need a dependable, full ignition replacement at a reasonable price. The reviewer found the kit addresses common ignition symptoms such as misfiring, stalling and rough idle by delivering stable high-voltage output across the RPM range. The package includes six coil packs and six spark plugs, making it a straightforward swap for engines that use the UF550/C1670 coils and 1406 spark plugs.

Key Features

• Multivehicle Compatibility: Fits a broad range of Nissan and Infiniti V6 models, simplifying parts selection for owners of Altima, Maxima, Murano, Pathfinder, 350Z and several Infiniti models.
• Durable Coil Construction: Coil packs use silicon steel, high-pressure rubber sleeves and Japan-imported epoxy resin to resist cracking and short-circuiting under heat and vibration.
• High-quality Spark Plugs: Iridium electrodes and CNC machined metal parts on the 1406 plugs offer improved ignition performance, faster start and smoother acceleration.
• OE-fit Standards: Coils and plugs meet or exceed original equipment specifications for form, fit and function, reducing the chance of fitment surprises during installation.
• Tested Reliability: Each component is subjected to strict quality tests to ensure stable high-voltage output and consistent performance throughout engine speeds.
• Complete Kit: Includes six ignition coils, six spark plugs and a manual, making it a one-stop replacement for six-cylinder engines.

Who It's For

This kit is best for DIY mechanics and professional technicians working on 3.5L V6 Nissan and Infiniti engines that accept UF550/C1670 coils and 1406 spark plugs. It is particularly useful when multiple cylinders show symptoms like stuttering, rough idle or reduced fuel economy and a bank replacement makes sense.

Drivers who prefer OEM-branded parts or need a single-cylinder replacement rather than a full set may want to look elsewhere. Also check the vehicle fitment images or detail page to confirm compatibility before purchasing to avoid returns.

Pros & Cons

Pros

• Improved engine smoothness and resolved misfire-related stuttering in real-world use.
• Durable materials in both coils and plugs that aim to extend service life under heat and vibration.
• Complete six-cylinder kit offers convenience and value compared with buying parts individually.
• Spark plugs with iridium electrodes provide reliable ignition and better throttle response.

Cons

• Fitment requires careful verification against vehicle year and engine; not every model year is supported.
• Some buyers who need only a single coil or plug may find a full six-pack unnecessary.

Specifications

Kit contents	6 ignition coils, 6 spark plugs, 1 manual
Coil OE numbers	UF550, C1670 and listed equivalents such as 22448-JA10C
Spark plug OE number	1406 (also referenced as 22401-1LA1C)
Spark plug material	Iridium electrode with ceramic insulator
Coil materials	Silicon steel, rubber sleeve, Japan epoxy, Germany enameled wire
Compatible engines	3.5L V6 Nissan and Infiniti models listed in product details

Our Verdict

For owners of compatible Nissan and Infiniti V6s who want a full ignition refresh, this UF550 coil and 1406 spark plug set is a practical, cost-effective choice. The kit combines durable coil construction and iridium spark plugs that address misfires and poor idle while offering the convenience of a complete six-cylinder replacement and good overall value.

Frequently Asked Questions

Will this kit fit my vehicle?
Check the detailed fitment images and model-year list; it is designed for a range of 3.5L V6 Nissan and Infiniti models but confirm against your vehicle before ordering.

How many items are included?
The package contains six ignition coil packs, six spark plugs and one manual for a full V6 replacement.

Do the parts meet OEM standards?
Yes, the coils and plugs are made to meet or exceed OE specifications for form, fit and function and are tested for stable high-voltage output.