WB-O2 NANO w/o Harness

The WB-O2 NANO w/o Harness is a wideband air-fuel ratio interface designed for precision engine tuning and real-time combustion monitoring. Built by FUELTECH USA, this compact sensor interface is engineered for enthusiasts, tuners, and performance shops who demand accurate AFR data for carbureted, naturally aspirated, turbocharged, and supercharged engines. The nano form factor makes it ideal for tight engine bays where space constraints limit installation options.

This wideband oxygen sensor interface converts raw O2 sensor signal into a standardized 0-5V analog output, enabling seamless integration with engine control units, standalone ECUs, and data acquisition systems. The onboard digital display provides real-time air-fuel ratio feedback during dyno testing, street tuning, and track sessions—critical for optimizing fuel delivery and ignition timing across the RPM band. Measuring just 4.7 x 2.3 x 6.8 inches and weighing only 0.19 lbs, the WB-O2 NANO delivers professional-grade accuracy without requiring a full harness assembly, allowing custom integration into OEM or custom fuel management systems.

Mechanics, engine builders, and tuning shops rely on the WB-O2 NANO to diagnose lean or rich conditions, validate fuel system upgrades, and achieve peak engine efficiency across all load ranges. The universal 0-5V output is compatible with most aftermarket ECUs and data loggers, making it an essential tool for forced induction builds, carburetor conversions, and fuel injection retrofits. Installation requires basic wiring knowledge and a compatible wideband oxygen sensor; the harness-free design provides flexibility for custom mounting and routing in specialized applications.