Wideband O2 Sensor - Bosch LSU 4.2 6 Pin DT

Overview

The Bosch LSU 4.2 wideband oxygen sensor is the gold standard for accurate AFR monitoring in performance builds. Pre-terminated with a female Deutsch DT-6 connector for direct compatibility with Haltech wideband controllers, this sensor delivers the precision AFR data essential for safe tuning and optimal power delivery across naturally aspirated, turbo, and supercharged applications.

Technical Specifications

• Part Number: HT-010714
• Sensor Type: Bosch LSU 4.2 wideband oxygen sensor
• Connector: Pre-terminated female Deutsch DT-6
• Thread: M18 x 1.5mm (requires matching weld-on bung)
• Operating Range: Lambda 0.65 to air (approximately 9.5:1 to 22:1 AFR)
• Response Time: <100ms at operating temperature

Why You Need This

Accurate AFR monitoring isn't optional in modern performance builds—it's what separates a properly tuned engine from an expensive paperweight. The Bosch LSU 4.2 sensor provides the precise feedback your Haltech ECU needs to maintain optimal fuel delivery across all operating conditions. Whether you're running a conservative street tune on an LS swap or pushing the limits on a big turbo 2JZ build, this sensor gives you the real-time AFR data to tune safely and extract maximum power.

Unlike cheap universal sensors that drift over time or narrow-band sensors that only work at stoichiometric ratios, the LSU 4.2 maintains accuracy across the full operating range—from rich power mixtures around 11:1 AFR to lean cruise conditions at 16:1 AFR. This is critical for turbocharged applications where AFR can swing dramatically between boost and vacuum conditions, and for naturally aspirated builds where precise lean cruise tuning maximises fuel economy without risking detonation.

ECU & System Compatibility

Direct plug-and-play compatibility with Haltech WB1 and WB2 wideband controllers when used with the appropriate adapter harness. Works seamlessly with the complete Haltech Elite and Nexus ECU range including Elite 550, 750, 1000, 1500, 2000, and 2500 models, plus Nexus R3, R5, and Rebel ECUs. The pre-terminated Deutsch connector eliminates field wiring—simply connect your adapter harness and you're ready to tune.

What's in the Box

• Bosch LSU 4.2 wideband oxygen sensor with factory-fitted Deutsch DT-6 female connector
• Sensor body with M18 x 1.5mm thread (weld-on bung sold separately)

Complete Your Build

Most customers installing this sensor also add the HT-010702 M18 x 1.5 weld-on bung for exhaust mounting, HT-010723 wideband adapter harness for ECU connection, and the HT-159976 WB1 Bosch CAN Controller Kit for complete wideband functionality. Billy's keeps all these components in UK stock for fast despatch, and our technical team can advise on the optimal exhaust placement and wiring configuration for your specific build. Get it right first time with proper component selection and expert pre-sales guidance.