Ignition Coil & Iridium Spark Plugs for Toyota Highlander (2008-2016) 3.5L V6

High-Output Ignition Coil & Iridium Spark Plugs for 2008-2016 Toyota Highlander (2GR-FE / XU40 & XU50)

Direct OEM replacement ignition coils and performance iridium spark plugs designed to restore optimal combustion efficiency and eliminate misfires in the 3.5L V6.

The Stock Highlander Ignition Weakness

Over time, the factory ignition coils on the XU40 and XU50 Toyota Highlander 3.5L V6 are prone to thermal degradation due to their positioning atop the transverse-mounted 2GR-FE engine. The rear bank (cylinders 1, 3, and 5) is notoriously difficult to access and suffers from elevated ambient heat trapped against the firewall. This continuous heat cycling degrades the internal epoxy potting and secondary windings inside the OEM coils, leading to internal shorting, weak spark delivery, and eventual P0300-series misfire codes. Furthermore, aging standard spark plugs increase the required firing voltage, compounding the stress on already weakened coils and resulting in poor fuel burn, rough idling, and a noticeable loss of low-end torque.

The Engineering Solution

This comprehensive ignition service kit bundles six high-energy ignition coils and six precision-gapped iridium spark plugs to permanently resolve 2GR-FE ignition failures. The upgraded coils feature premium copper wire windings and high-temperature dielectric epoxy that resists thermal breakdown and electrical arcing, even in the restrictive firewall-facing rear cylinder bank. Paired with ultra-fine wire iridium center electrodes, these spark plugs require less voltage to bridge the gap, which reduces the electrical load on the ignition coils while ensuring a more complete, consistent fuel burn. This combination restores factory horsepower, improves throttle response, prevents unburned fuel from damaging the catalytic converters, and significantly extends the service interval over traditional alternatives.

Technical Specifications

Compatibility

• 2008 Toyota Highlander 3.5L V6
• 2009 Toyota Highlander 3.5L V6
• 2010 Toyota Highlander 3.5L V6
• 2011 Toyota Highlander 3.5L V6
• 2012 Toyota Highlander 3.5L V6
• 2013 Toyota Highlander 3.5L V6
• 2014 Toyota Highlander 3.5L V6
• 2015 Toyota Highlander 3.5L V6
• 2016 Toyota Highlander 3.5L V6

The Toyota Reliability Standard

By upgrading to premium iridium ignition components, you ensure your Highlander maintains the steadfast towing capability and long-term reliability required for daily hauling and extended road trips, keeping the check engine light off and the 2GR-FE engine running flawlessly.

Common Questions

Will this fit my 2013 Highlander 3.5L?
Yes. It fits 2008-2016 Toyota Highlander models with the 3.5L 2GR-FE V6.

What is in the kit?
Six ignition coils and six precision-gapped iridium spark plugs, enough for both cylinder banks.

Will it protect my catalytic converter?
Yes. A complete, consistent burn keeps unburned fuel from reaching and damaging the converter.

Does it fit the 2.7L 4-cylinder Highlander?
This kit is made for the 3.5L 2GR-FE V6.

Why replace all six at once?
The rear-bank coils sit against the firewall and take the most heat. Doing all six at once saves pulling the intake again later.