The Claas 0011669850 Urea Sensor Set is an original equipment manufacturer (OEM) part designed for Claas agricultural machinery. This essential component accurately measures urea (AdBlue) levels, critical for the efficient operation of the Selective Catalytic Reduction (SCR) system. It ensures optimal emissions control and engine performance in compatible Claas Arion 500, Arion 600, Axion 800, Axion 900, Xerion 4000, and Xerion 5000 series tractors.