Ignition Coil + Iridium Spark Plugs for Subaru Legacy Outback (2012-2017) 3.6L

Direct-Fit Ignition Coil & Denso Iridium Spark Plug Kit for 2012-2017 Subaru Legacy, Outback (BM/BR/BN/BS)

What it Does: The ignition overhaul kit replaces aged coil-on-plug modules and worn spark plugs on the 2012-2017 Subaru Legacy and Outback to restore complete secondary combustion, eliminate high-rpm misfires, and stabilize idle quality.

The Stock Subaru Legacy, Outback Ignition Breakdown

The horizontally opposed layout of the EZ36D 3.6-liter boxer-6 positions cylinder heads inches from the chassis rails, concentrating severe radiant thermal stress directly onto the factory coil boots and internal transformer windings. Over extended thermal cycling, factory dielectric epoxy degrades and micro-cracks form along the coil bodies. This breakdown induces internal shorting, high-voltage leakage, and weakened spark output under load. Concurrently, factory spark plug ground electrodes suffer from gap erosion, demanding increased breakdown voltage from deteriorating coils. The result is unburned hydrocarbons, sluggish throttle response, random misfire fault codes (P0300-P0306), and compromised fuel economy.

The Engineering Solution

This direct-replacement kit provides high-temperature thermoplastic coil-on-plug housings engineered with reinforced internal copper winding spools to resist sustained heat soak. Matched with Denso IKH20 iridium-tipped spark plugs featuring a fine-wire 0.4mm center electrode, the combination significantly drops required firing voltage while maximizing spark kernal expansion. High-grade silicone spark plug boots and internal suppressing resistors eliminate RF interference and arc tracking across wide thermal swings, sustaining a hot, stable ignition discharge directly through high cylinder pressures.

What's Included

• 6 Ignition Coils
• 6 Denso Iridium Spark Plugs (IKH20)

Technical Specifications

Compatibility

• 2012-2017 Subaru Legacy 3.6L (EZ36D)
• 2012-2017 Subaru Outback 3.6L (EZ36D)

Frequently Asked Questions & Fitment Warnings

Does this fit the BM/BR/BN/BS Legacy, Outback?

Yes, this is a direct fit for the 2012-2017 Subaru Legacy and Outback equipped with the EZ36D 3.6L 6-cylinder engine. This kit does not fit 2.5L 4-cylinder EJ25 or FB25 models.

Should spark plugs and coil packs be installed simultaneously?

Yes, replacing spark plugs alongside coils ensures balanced secondary circuit resistance across all six cylinders and prevents premature failure of new coils due to excessive plug gap resistance.

The Subaru Precision Standard

Built to handle the demanding horizontal architecture of Subaru's flat-six powerplants, this kit delivers consistent high-voltage delivery to preserve linear throttle delivery and smooth, balanced boxer operation across all driving conditions.