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The concept and evaluation results of the compact heaterless O2 sensor (activated with exhaust gas heat) that is suitable for the FI (Fuel Injection) system for small motorcycles are introduced.To realize the heaterless, low temperature operation at 280℃ is achieved by using high ion conductive solid electrolytes and low interface resistance electrodes, and the element temperature could be kept to 350℃ and above during an actual vehicle EC mode driving by a small-thin element and a high heat receiving cover.As a result, early rises in temperature and early activation with the heaterless O2 sensor are made possible at engine cold starting.