Ignition Coil & Iridium Spark Plugs for Scion tC (2011-2016) 2.5L I4

High-Output Ignition Coils & Iridium Spark Plugs for 2011-2016 Scion tC (2AR-FE / AGT20)

What it Does: Upgrades the factory ignition system with high-output coils and fine-wire iridium spark plugs to resolve misfires, improve throttle response, and ensure complete combustion.

The Stock 2AR-FE Ignition Weakness

The factory ignition coils on the 2.5L 2AR-FE engine are prone to thermal degradation from continuous engine bay heat cycles. Over time, internal winding resistance increases and the protective epoxy micro-cracks, causing voltage leaks. Standard spark plugs also suffer from rapid electrode wear, which inherently widens the spark gap. This higher voltage demand stresses aging coils, causing spark blow-out under load, rough idling, incomplete fuel atomization, and lost torque.

The Engineering Solution

This ignition upgrade resolves these issues using high-grade internal components. The replacement coils feature high-density copper windings and high-dielectric epoxy to resist thermal breakdown and deliver maximum voltage output. Paired with fine-wire iridium spark plugs, the system requires less electrical energy to bridge the gap while generating a hotter, more consistent flame kernel. Iridium’s ultra-high melting point prevents gap widening over the life of the plug. This synergy ensures optimal cylinder pressure, precise spark timing, and restores factory horsepower, throttle response, and fuel efficiency.

Technical Specifications

Compatibility

• 2011 Scion tC 2.5L I4
• 2012 Scion tC 2.5L I4
• 2013 Scion tC 2.5L I4
• 2014 Scion tC 2.5L I4
• 2015 Scion tC 2.5L I4
• 2016 Scion tC 2.5L I4

The Scion Performance Standard

Engineered to meet the electrical demands of modern JDM platforms, this ignition overhaul ensures the 2AR-FE delivers reliable, consistent power delivery whether navigating daily commutes or pushing through spirited canyon roads.