Ignition Coil and Iridium Spark Plugs for Ford Focus (2016-2018) 2.3L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2016-2018 Ford Focus

Direct-Replacement Ignition Overhaul: Restores factory combustion efficiency and eliminates under-boost misfires by pairing high-grade ignition coils with premium iridium-tipped spark plugs.

The Stock Focus Dielectric Breakdown and Spark Blowout

Under the high thermal loads and elevated cylinder pressures generated by the turbocharged 2.3L platform, factory ignition coils experience insulation breakdown and secondary winding resistance drift over time. Coupled with electrode erosion on aging spark plugs, this degradation leads to high-load spark blowout, rough cold starts, reduced throttle response, and unburned fuel entering the exhaust tract.

The Engineering Solution

This service kit addresses secondary voltage loss through durable coil-on-plug assemblies engineered with high-conductivity internal copper windings and heat-stabilized thermoplastic housings. Paired with fine-wire iridium core spark plugs, the system reduces required firing voltage, promotes rapid flame kernel expansion, and ensures dependable arc stability across all engine loads.

Technical Specifications

Compatibility

• 2016-2018 Ford Focus — RS (2.3L L4 Gas Turbocharged / Chassis: C346)
• Interchange Part Numbers: UF670, DG546, 5C1873, CM5Z-12029-A, CM5E-12A366-BC, CM5E12A366CA, JDE30294, 6736203

The Ford Performance Standard

Engineered to handle elevated boost levels and aggressive power delivery, this ignition package provides instant throttle modulation, zero misfire hesitation, and rock-solid idle consistency for street and track demands.