Evo X / RA - Rear O2 Trigger Module

The XSpec Rear O2 Module is a custom-developed add-on that uses the rear O2 sensor input to trigger custom functionality on the Evo X / Ralliart ECU, such as Rolling Antilag. The module is plug and play and requires a fused, switched 12V source for activation. This listing is for the module only — a +12v switch solution for the Evo X / Ralliart is available here. All modules are made to order and assembled in New Zealand. Each module is tested during our quality assurance process to ensure that it functions as intended. Production lead time is 1-3 business days depending on order volume. Please contact us directly for bulk pricing.

What is the Rear O2 Module?

The Rear O2 Module lets you safely activate custom functionality through the rear O2 sensor input, which is commonly disabled on tuned Evo X / Ralliart platforms. In factory form, the rear O2 sensor is used purely for emissions monitoring, making it a free, unused input that doesn't interfere with other factory functions. The module plugs into the factory rear O2 sensor connector under the right-hand seat and requires a switched 12V source for activation. It's compatible with the Rolling Antilag Patch and can be used to trigger other custom functionality on the Evo X / Ralliart ECU.

What is included:

• Rear O2 Module, including a factory-style connector
• Installation Instructions

Requirements:

• A fused, switched 12V input source for activation (not included). A full plug and play switch solution is available here.
• A patched ROM that activates custom functionality based on the rear O2 sensor input.

Installation:

The module is designed to be plug and play, requiring no modifications to the factory wiring. Simply connect the module to the rear O2 sensor connector under the right-hand seat, then connect the switched 12V source for activation. Follow the included installation instructions for proper setup.

Note:

This module is intended for use with custom functionality on the Evo X / Ralliart ECU, such as Rolling Antilag. It is not a standalone product and requires compatible ROM modifications and configuration to function properly. The vehicle's rear O2 sensor must also be removed and disabled, which may affect emissions compliance in some regions. Please check local regulations before installation.