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Most of the recent clean diesel engines are equipped with an exhaust gas recirculation (EGR) technology in order to meet the strict criteria of NOx and particulate matter (PM) as required in the current emission regulations. More attention to strict EGR control is becoming required. Accurate and fast transient EGR ratio operation is becoming very critical in the field of the emission control. The EGR ratio is typically monitored by CO₂ trace method, in which CO₂ emitted from engine, is utilized as a tracer gas. The EGR ratio can be obtained from CO₂ concentration measured at engine intake and engine out at the same time. In this study, authors have developed a new EGR analyzer consisting of two CO₂ detectors, to achieve required performance for transient measurement, i.e., short delay time and quick response, negligible difference between two CO₂ detectors, and capability of wet measurement.