Nexus Plug-in DBW Expansion Harness 2.5m (8)

Overview

The Nexus Plug-in DBW Expansion Harness unlocks the full potential of your Nexus ECU by adding eight critical sensor connections through the auxiliary plug. This 2.5-metre harness eliminates the need for custom wiring, giving you plug-and-play access to drive-by-wire throttle control, flex fuel sensing, and comprehensive engine monitoring in one professional-grade solution.

Technical Specifications

• Part Number: HT-189003
• Harness Length: 2.5 metres (8.2 feet)
• Connection Count: 8 auxiliary sensor inputs
• Wire Gauge: Automotive-grade copper conductors
• Connector Type: Haltech Nexus auxiliary plug compatible
• Operating Temperature: -40°C to +125°C

Why You Need This

Modern engine swaps demand more than basic fuel and ignition control — you need comprehensive sensor monitoring and drive-by-wire capability. This expansion harness solves the most common limitation of Nexus Plug-in installs: running out of inputs for critical sensors. Without proper sensor integration, you're flying blind on AFR monitoring, fuel quality compensation, and engine protection parameters.

We see this constantly with LS swaps into Japanese chassis and modern turbo builds where customers want to retain factory drive-by-wire throttles. The factory harness typically covers your basic inputs, but adding a wideband O2 sensor, flex fuel capability, and comprehensive pressure monitoring requires this expansion. Rather than bodging additional wiring or compromising on sensor coverage, this harness gives you eight properly terminated connections that integrate seamlessly with your Nexus ECU's calibration tables.

ECU & System Compatibility

Specifically designed for Haltech Nexus R3, R5, and Rebel ECUs with plug-in applications. The harness connects directly to the ECU's auxiliary plug, providing dedicated inputs for wideband O2, air temperature, flex fuel, fuel pressure, oil pressure, APP (accelerator pedal position), and DBW (drive-by-wire) throttle connections. Contact our technical team to confirm compatibility with your specific Nexus model and vehicle application.

What's in the Box

• Nexus Plug-in DBW Expansion Harness (2.5m length)
• Auxiliary plug connector (pre-terminated)
• Eight sensor connection leads with protective covering
• Installation documentation and pin-out diagram

Complete Your Build

Most customers completing a Nexus expansion install also add wideband O2 sensors for proper AFR monitoring and flex fuel sensors for E85 capability. Our technical team can recommend the complete sensor package for your application and confirm all components are in stock for immediate despatch. We stock the full range of Haltech sensors and accessories, eliminating the frustration of waiting weeks for backordered components from multiple suppliers.