In all fuel-injected vehicles, an exhaust-based sensor is utilized to determine the air/fuel mixture. In older fuel-injected cars, this function is performed by a relatively basic "narrow band" sensor, which provides the engine control unit (ECU) with a basic indication of the combustion state. In contrast, newer model vehicles employ an advanced "wide band" O2 sensor capable of actively monitoring the combustion state in real-time throughout the entire range of engine speeds. A malfunctioning narrow band sensor in older vehicles can result in reduced fuel efficiency and performance issues, particularly in cold conditions. Conversely, a faulty wide band sensor in a newer model vehicle may trigger a "limp mode" condition, causing the check engine light to illuminate and requiring immediate replacement.

Bosch offers a broad range of O2 sensors suitable for the majority of fuel-injected vehicles in the Australian fleet. To find the correct O2 sensor for your specific vehicle, you can simply enter your vehicle registration information using the "Add your Vehicle" tab at the top of this page. Alternatively, you can provide the make, model, and series of your vehicle to refine your search and locate the appropriate O2 sensor for your particular vehicle.