O2 Sensor Weldable Fitting Bung and Blanking Plug M18 x1.5

Overview

Professional-grade M18 x 1.5 weld-on oxygen sensor bung with copper washer seal and blanking plug, engineered for permanent exhaust installations in performance builds. Essential for accurate lambda readings in turbo setups, naturally aspirated builds, and EFI conversions where OEM sensor locations won't cut it.

Technical Specifications

• Part Number: HT-010702
• Thread: M18 x 1.5
• Material: Steel construction
• Includes: Copper washer seal and blanking plug
• Installation: Weld-on fitting

Why You Need This

Getting accurate lambda readings means positioning your O2 sensor precisely in the exhaust flow — something factory locations rarely achieve in modified applications. Whether you're building a turbo LS swap, upgrading an RB25 setup, or converting a carburetted classic to EFI, you need sensor placement that actually represents your air-fuel ratio, not some compromised OEM position designed around emissions regulations.

This bung solves the common problem of inaccurate readings from poorly positioned sensors. Install it 18-24 inches downstream from your turbo (after the wastegate merge), or 12-18 inches from the exhaust port on naturally aspirated builds. The copper washer ensures a gas-tight seal under thermal cycling, while the included blanking plug lets you seal the fitting when switching between wideband and narrowband sensors during tuning phases.

ECU & System Compatibility

Works with all Haltech wideband controllers and ECU systems including Elite 550, Elite 750, Elite 1000, Elite 1500, Elite 2000, and Elite 2500 models. Also compatible with Nexus R3, R5, and Platinum series ECUs when paired with appropriate lambda sensors and controllers.

What's in the Box

• M18 x 1.5 steel weld-on bung
• Copper washer seal
• Threaded blanking plug

Complete Your Build

Most customers installing O2 sensor bungs also add Haltech wideband sensors and controller modules to complete their lambda monitoring setup. Popular combinations include the CAN Lambda Controller for Elite ECU integration, or standalone WB1/WB2 controllers for older systems. We hold comprehensive UK stock of Haltech lambda sensors, extension looms, and mounting hardware — our technical team can specify the complete package for your specific engine and exhaust configuration before you order.