Ignition Coil and Iridium Spark Plugs for Hyundai Sonata (2011-2014) 2.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2011-2014 Hyundai Sonata

What it Does: The ignition coil and iridium spark plug kit restores primary secondary ignition circuit integrity on the 2011-2014 Hyundai Sonata to eliminate misfires, stabilize idle RPM, and restore combustion efficiency under boost.

The Stock Hyundai Sonata Ignition Breakdown

Factory coil packs on the YF chassis running the Theta II (G4KH) turbocharged engine are subjected to extreme thermal cycling and cylinder head heat soak. Over time, the internal copper primary and secondary windings degrade, resulting in micro-arcing and insulation breakdown inside the pencil coil boot. Simultaneously, high cylinder pressures under load widen standard spark plug gaps prematurely, triggering common P0300 through P0304 DTC fault codes, hesitation during tip-in throttle, and lost thermal efficiency.

The Engineering Solution

This comprehensive tune-up kit delivers four heavy-duty coil-on-plug pencil units paired with precision laser-welded iridium electrode spark plugs. The ignition coils feature high-dielectric epoxy resin encapsulation to resist thermal breakdown and eliminate voltage leakage across the spark track. Combined with ultra-fine wire iridium center electrodes and platinum ground pads, this kit provides a stable, concentrated spark kernel that resists spark blowout under peak boost while operating at lower required primary firing voltages. Replaces interchange numbers UF647 and HL3Z12029A.

Technical Specifications

Compatibility

• 2011 Hyundai Sonata 2.0L 4-Cylinder Turbo (YF)
• 2012 Hyundai Sonata 2.0L 4-Cylinder Turbo (YF)
• 2013 Hyundai Sonata 2.0L 4-Cylinder Turbo (YF)
• 2014 Hyundai Sonata 2.0L 4-Cylinder Turbo (YF)

Frequently Asked Questions

Does this fit the YF Sonata?
Yes, this is a direct fit for the 2011-2014 Hyundai Sonata equipped with the Theta II 2.0L engine.

Are the spark plugs pre-gapped for direct installation?
Yes, the iridium plugs are pre-gapped to factory specifications, though checking gap clearance prior to threading is always recommended.

The Hyundai Reliability Standard

Engineered to withstand the demanding cylinder pressures of forced-induction direct-injection engines, this ignition kit maintains complete diagnostic compliance, preventing check engine lights and restoring smooth daily drivability.