Bosch O2 Sensor

The Bosch O2 Sensor by Holley is a wideband oxygen sensor engineered for precision engine management and emissions monitoring in fuel-injected performance and street engines. This sensor is specifically designed to work with the Holley Commander 950 ECU, delivering real-time air-fuel ratio data that enables accurate engine tuning and optimal combustion efficiency. Whether you're building a custom engine, upgrading an existing fuel injection system, or fine-tuning a performance platform, a quality wideband oxygen sensor is essential for achieving repeatable results and maintaining clean emissions.

Wideband oxygen sensors like this Bosch unit operate across a much wider air-fuel ratio range than conventional narrowband sensors, allowing the Holley Commander 950 to continuously monitor and adjust fueling in real time. The sensor's design measures oxygen content in the exhaust stream with high precision, transmitting a linear voltage signal proportional to the air-fuel ratio—typically from 7.35 to 22.39:1 AFR. This level of accuracy is critical for engine builders and tuners who need stable, data-driven feedback during dyno testing, street driving, or track use; without it, fuel mapping remains guesswork. The compact form factor and durability of Bosch sensor construction ensure reliable long-term operation under high-temperature exhaust conditions.

This oxygen sensor is ideal for anyone running a Holley Commander 950 fuel injection controller on a street, race, or restomod engine. Installation requires direct mounting in the exhaust manifold or header primary, with proper sensor bung provision and wiring integration into the ECU harness. Tuners, engine builders, and performance enthusiasts rely on wideband sensors to validate and refine fuel tables, verify turbocharger tuning, and diagnose drivability issues. The sensor's compact 0.37 lb weight and modest dimensions make it a straightforward retrofit or new-build component for virtually any custom fuel injection setup.