2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 92Get this manual
EFIIgnition Systems Wide Band Lambda Sensor Circuit
The wide band lambda sensor (O2) is responsible for measuring the amount of oxygen within the exhaust stream and the actual deviation from lambda1A heater element within the sensor allows the sensor to quickly reach the desirable sensor operating temperature after the engine is startedThe lambda sensor is located on the exhaust pipe after the turbocharger on FST modelsOn FS models, the sensor is located on the manifoldIt is important not to contaminate the sensor probe with engine coolant or solvents