Ignition Coil and Iridium Spark Plugs for Ford Focus (2015-2018) 1.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2015-2018 Ford Focus

What it Does: The ignition coil and iridium spark plug kit replaces degraded factory ignition components on the 2015-2018 Focus to eliminate secondary ignition breakdown, misfire codes, and restore peak combustion efficiency.

The Stock Ford Focus Thermal Stress and Coil Insulation Breakdown

The compact cylinder head architecture of the turbocharged 1.0L EcoBoost platform generates high thermal loads in tightly confined plug wells. Over time, OEM pencil coils succumb to dielectric breakdown, high-voltage arcing, and micro-cracking across the silicone boot. Coupled with electrode erosion on high-mileage factory plugs, widened plug gaps increase the required firing voltage, straining primary driver circuits in the PCM and causing hesitation, rough idle, and typical P0300 through P0303 misfire DTCs under peak boost.

The Engineering Solution

This service kit provides a complete refresh engineered to withstand the rigorous cylinder pressures of direct-injected forced induction. The three coil-on-plug pencil units feature high-grade magnetic copper windings, vacuum-potted epoxy insulation to eliminate internal voids, and high-temp silicone boots that resist thermal hardening and spark flashover. Matched with fine-wire iridium spark plugs, the system delivers lower required breakdown voltage, superior quenching resistance, and consistent spark kernel propagation across the entire powerband.

Technical Specifications

Compatibility

• 2015 Ford Focus S / SE 1.0L EcoBoost (C346)
• 2016 Ford Focus SE 1.0L EcoBoost (C346)
• 2017 Ford Focus SE 1.0L EcoBoost (C346)
• 2018 Ford Focus SE 1.0L EcoBoost (C346)

Frequently Asked Questions

Does this fit the C346 Focus?
Yes, this is a direct fit for the 2015-2018 Ford Focus equipped with the 1.0L EcoBoost engine.

Are the spark plugs pre-gapped for the 1.0L turbo application?
Yes, but checking electrode gap against factory specification (0.028-0.031 in) prior to installation is recommended to guarantee zero spark blowout under boost.

The Ford Commuter Standard

Engineered for exacting European-platform tolerances, these direct-replacement ignition components preserve factory emissions compliance, smooth power delivery, and CEL-free reliability throughout daily operational duty cycles.