Ignition Coils UF646 and Iridium Spark Plug SP534 Set of 6 - Reliable

In this review the TAUXMZ ignition coil pack UF646 paired with iridium spark plug SP534 is evaluated as a practical replacement kit for 3.5L V6 turbo Ford and Lincoln engines from the 2011-2020 era. The bottom line: it is best for owners who need a direct, OE-level swap to restore power and smooth idle without paying dealer prices. The kit's strongest selling point is the combination of durable coil construction and iridium plugs that together reduce misfires and improve cold-start response.

Key Features

• Wide Vehicle Fitment: Covers many 3.5L V6 turbo applications including F-150, Expedition, Explorer, Flex, Transit and select Lincoln models for straightforward replacement.
• Durable Coil Construction: Coil packs use silicon steel, high-pressure rubber sleeves, Japan-imported epoxy resin and Germany-imported enameled wire for long service life and resistance to cracking.
• OE Compatibility: Sold as direct replacements for OE numbers like UF646 and compatible Ford OEM part references to simplify ordering and installation.
• Iridium Spark Plugs: SP534 iridium plugs use a fine center electrode and robust ceramic to help deliver quicker starts and stable combustion under load.
• Improved Driveability: Designed to reduce engine misfire, rough idle and power loss when replacing failed coils and worn plugs, restoring a smoother running engine.
• Value Packaging: Supplied as a set of six coils and plugs so all cylinders are renewed at once, eliminating mixed-age ignition parts.

Who It's For

This kit is aimed at DIY mechanics and independent shops working on 3.5L V6 turbocharged Ford and Lincoln models from roughly 2011 through 2020 who want an OE-level replacement without dealer markup. It suits drivers noticing misfires, rough idle or reduced power who prefer to replace all ignition components at once to prevent repeat issues.

Those who should look elsewhere include owners unsure of exact engine fitment who do not want to verify OE numbers, or drivers who require factory-brand parts with dealer warranty coverage; check vehicle compatibility carefully before purchase to avoid incorrect plugs or coil connectors.

Pros & Cons

Pros

• Coil packs and plugs restore engine performance and reduce misfires when matched to the correct vehicle fit.
• Iridium SP534 plugs deliver reliable cold-start response and stable combustion over time.
• High-quality materials in the coils promise longer life and resistance to cracking or shorting.
• Complete 6-piece set is convenient and cost effective for full-bank replacement.

Cons

• Some users report fit issues with the electrical plug connection on a minority of installs, so verify connector style before fitting.
• Fitment requires careful checking against OE numbers to avoid ordering the wrong set for similar engines.

Specifications

Product Type	Ignition coils and iridium spark plugs set (6)
Coil OE Numbers	UF646, DG-549 and related Ford references
Spark Plug Model	SP534 (iridium electrode)
Engine Fitment	3.5L V6 Turbocharged applications
Vehicle Coverage	Ford F-150, Expedition, Explorer, Flex, Transit, Police Interceptor, Taurus; Lincoln MKS, MKT, Navigator
Construction	Silicon steel, high-pressure rubber sleeve, imported epoxy resin, enameled wire

Our Verdict

The UF646 coil and SP534 iridium plug set is a sensible, cost-effective way to eliminate misfire and regain engine smoothness on compatible 3.5L V6 turbo Ford and Lincoln vehicles. It offers durable coil construction and long-life iridium plugs, making it a good value for DIY owners and independent shops who confirm exact fitment before ordering.

Frequently Asked Questions

Will this kit fit my 2015 F-150 3.5L V6?
Yes, the set lists compatibility with 2011-2015 3.5L V6 Turbo F-150 models, but confirm your vehicle's OE part numbers against the listing before purchase.

How long do the coils and plugs typically last?
Coils are designed to resist cracking and shorting and the plugs use an iridium electrode for extended life; the product description notes reliable operation beyond typical intervals and avoidance of misfire for many miles.

Are these direct OE replacements?
They are marketed as direct replacements compatible with UF646 and several Ford OE references; proper fit verification is recommended to ensure correct connector and plug gap requirements.