Onboard Wideband Bosch LSU 4.9 Sensor Kit for Nexus Series and Elite PRO Plug-in ECUs

Overview

Essential wideband oxygen sensor kit featuring the industry-standard Bosch LSU 4.9 sensor with 1.2m harness, designed specifically for Haltech Nexus and Elite PRO Plug-in ECUs. Delivers precise air-fuel ratio monitoring across the full range from rich idle to lean cruise, giving you the real-time data needed for proper tuning and engine protection.

Technical Specifications

• Part Number: HT-010740
• Sensor Type: Bosch LSU 4.9
• Harness Length: 1.2m (4 feet)
• Lambda Range: 0.65 to infinity
• AFR Range: 9.5:1 to 22:1 (petrol)
• Response Time: <100ms
• Operating Temperature: 350-900°C

Why You Need This

Wideband monitoring isn't optional on any serious performance build — it's your primary defence against detonation and your window into proper fuel tuning. The Bosch LSU 4.9 remains the gold standard because it reads accurately across the entire AFR spectrum, from rich cold-start conditions through to the lean cruise zones where cheaper sensors fall flat. We see too many engine failures from builders running blind or trusting narrow-band sensors that can't actually measure the lean conditions modern ECUs target for efficiency.

This kit is purpose-built for onboard installation in Nexus and Elite PRO applications where you need continuous AFR feedback directly into the ECU. Whether you're tuning an LS swap that needs precise closed-loop fuelling, a turbo RB25 where AFR monitoring prevents expensive mistakes under boost, or a naturally aspirated Honda build chasing maximum efficiency, this sensor gives your Haltech ECU the real-time data it needs. The 1.2m harness length suits most engine bay installations without requiring extensions that introduce potential failure points.

ECU & System Compatibility

Compatible with Haltech Nexus R3, R5, and Rebel ECUs, plus all Elite PRO Plug-in models including Elite 550, 750, 1000, 1500, 2000, and 2500 variants. The onboard wideband controller handles sensor conditioning and provides direct lambda feedback to your ECU for closed-loop fuel control and real-time monitoring through your dash or laptop.

What's in the Box

• Bosch LSU 4.9 wideband oxygen sensor
• 1.2m pre-terminated sensor harness
• Installation hardware and mounting components
• Haltech installation documentation

Complete Your Build

Most customers adding wideband monitoring also require a proper exhaust bung and sensor mounting hardware — contact our technical team for recommended installation components specific to your application. If you're building a complete engine management system, we stock the full range of Haltech sensors, injector drivers, and expansion modules with fast UK despatch. Our in-house tuners can advise on sensor placement and calibration requirements during your pre-sales consultation.