Wideband Extension Harness 1200mm suits LSU4.9 Length: 1.2M (4ft)

Overview

The Haltech 1200mm Wideband Extension Harness delivers precisely what serious builders need: proper sensor placement without compromising signal integrity. Purpose-built for LSU4.9 sensors, this 4-foot extension lets you position your wideband exactly where it needs to be for accurate AFR readings in challenging engine bay layouts.

Technical Specifications

• Part Number: HT-010719
• Length: 1200mm (4 feet)
• Sensor Compatibility: LSU4.9 wideband oxygen sensors
• Construction: High-temperature automotive grade wiring
• Connector Type: Factory Haltech CAN Wideband Controller compatible

Why You Need This

Engine swaps and custom builds rarely offer convenient sensor mounting locations. That LSU4.9 sensor needs to be positioned correctly in the exhaust stream — typically 18-24 inches downstream from the turbo or header collector — but your Haltech CAN Wideband Controller might be mounted elsewhere in the engine bay. Standard sensor cables often fall short, forcing compromises on sensor placement that directly impact AFR accuracy and tuning quality.

We see this constantly with LS swaps into older chassis, RB and SR20 builds with relocated ECU mounting, and turbo setups where the optimal sensor position conflicts with controller placement. Poor sensor positioning means inaccurate readings during transient conditions — exactly when precise AFR monitoring matters most. This extension harness eliminates the guesswork, letting you mount the sensor where physics demands while keeping your wideband controller in a sensible, accessible location.

ECU & System Compatibility

Designed specifically for Haltech CAN Wideband Controllers paired with LSU4.9 sensors. Compatible with Elite 550, 750, 1000, 1500, 2000, and 2500 ECUs, plus the full Nexus R3 and R5 range when used with appropriate wideband controller setups. The LSU4.9 sensor compatibility makes this suitable for most modern Haltech wideband implementations.

What's in the Box

• 1 x Haltech Wideband Extension Harness (1200mm)
• LSU4.9 sensor connectors (pre-terminated)
• Installation documentation

Complete Your Build

Most customers fitting this extension harness are completing comprehensive wideband setups. Consider pairing with a quality LSU4.9 sensor if you're upgrading from older technology, and don't forget proper exhaust bungs and mounting hardware for professional installation. Our technical team stocks compatible sensors, controllers, and installation accessories with same-day despatch from our UK warehouse. Contact us for application-specific advice on sensor placement and wiring routing for your particular build.