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NGK / NTK OZA851-EE4 / 91461 Lambda / Oxygen Sensor Zirconia O2 Exhaust ProbeLambda sensors are oxygen detecting devices that are fitted into the exhaust system of increasingly more internal combustion engines. They are a vital part of the emission reduction technology and also help to ensure that the engine is running at its optimum performance. NGK Spark Plug Co Ltd was a pioneer in this field and is now a world leader in the development and production of Lambda sensors under the NTK brand name.The zirconium dioxide lambda sensor is distinguished by the following characteristics: Fast operational readiness Temperature resistance Not sensitive to hydraulic shock Resistant to contamination High level of reliability These sensors are used as a regulating and as a diagnostic sensor, depending on the vehicle.ITEM FEATURES:Number of Circuits: 4Length: 800 mmLambda Sensor Type: ZirconiaOE Numbers: 1326 416 , 1327 547 , 1327 548 , 1346 366 , 3M519 F472 CB , 3M519 F472 DA , 3M519 F472 DB , 3M519 F472 DCSuperceded Part Numbers: OZA770-EE69,OZA770-EE70