UF656 Ignition Coil & 93501 Double Iridium Spark Plug Kit - Reliable

Our review of the UF656 Ignition Coil & 93501 Double Iridium Spark Plug kit finds it best suited for Mazda owners seeking a direct replacement set to restore engine smoothness and fuel economy. The package includes four ignition coil packs and four double iridium spark plugs, engineered to match or improve on OE design for straightforward installation. Many users reported quicker starts, fewer misfires, and a measurable improvement in gas mileage after fitting the kit, making it a practical choice for those repairing or maintaining 2.0L and 2.5L Mazda four-cylinder engines.

Key Features

• Vehicle compatibility: Direct replacement fit for a range of Mazda models from 2012 to 2020, which simplifies part selection for common 2.0L and 2.5L L4 engines.
• Complete kit: Ships with four ignition coil packs and four double iridium spark plugs, providing all items needed for a full bank replacement.
• Long-life spark plugs: Double iridium electrodes are designed for extended service life and consistent spark, which helps sustain combustion performance over time.
• Improved cold-start and idle: Coil design and spark plug chemistry aim to reduce misfires and rough idle, improving driveability after installation.
• OE-matching construction: Coils use thermoplastic connectors and stainless-steel springs to resist heat cycling and provide reliable high-voltage transfer.

Who It's For

This kit is geared toward owners of compatible Mazda 3, Mazda 6, CX-3, CX-5, and MX-5 Miata models who need a straightforward, parts-matching replacement to address misfires, rough idle, or reduced fuel efficiency. DIYers and independent shops will appreciate that the components are supplied in a complete set so all four cylinders can be serviced at once.

It is not aimed at owners looking for performance tuning parts or specialty racing ignition systems; those users should seek high-performance aftermarket ignition components designed specifically for increased output or modified engines.

Pros & Cons

Pros

• Good fit and easy installation, with multiple customers reporting quick swaps and a secure fit in OE locations.
• Improved fuel efficiency and smoother idle reported after replacement, reflecting functional benefits of both coils and iridium plugs.
• Durable materials in coil construction and long-life double iridium plugs promise extended service intervals compared with standard plugs.

Cons

• Spark plug durability received mixed feedback from some customers, so longevity may vary with driving conditions and maintenance.
• No instruction manual included, so less experienced installers may need to reference online guides or a repair manual.

Specifications

Manufacturer Part Number	UF656+93501
Replacement Part Numbers	UF656, PE0118100A, C1837, 5C1894, GN10625, C-857
Included Components	Ignition Coil Packs x4, Double Iridium Spark Plug x4
Compatible Engines	2.0L and 2.5L L4 Mazda engines
Compatible Models	Mazda 3, Mazda 6, CX-3, CX-5, MX-5 Miata (see product images for model years)
After-Sales Service	24-hour customer service and 1 year product service

Our Verdict

The UF656 coil and 93501 double iridium spark plug kit is a practical, cost-effective replacement for Mazda owners who need to restore smooth running and improve fuel efficiency. It delivers reliable fitment and easier installation for whole-bank servicing, and the iridium plugs coupled with OE-like coils make it good value for everyday drivers rather than performance enthusiasts.

Frequently Asked Questions

Will this kit fit my Mazda 3?
It fits a wide range of Mazda 3 model years listed in the product images; confirm the exact years in the included vehicle compatibility reference before purchase.

Are instructions included?
No instruction manual is included, so follow a repair manual or reputable online guide for removal and installation steps.

What warranty is offered?
The seller provides 24-hour customer support and a 1 year product service policy for installation or quality concerns.