The present invention relates to methods and systems to detect oxygen sensor degradation due to sealant off-gassing. Methods and systems are provided for detecting exhaust gas oxygen sensor degradation due to sealant off-gassing. In one example, a method may include indicating exhaust gas oxygen sensor degradation due to sealant off-gassing responsive to a change in fueling demand without a changein driver-demanded torque after a threshold exhaust temperature has been reached. In response to the indication, a measurement correction may be learned and applied to measurements of the exhaust gasoxygen sensor in order to accurately determine an air-fuel ratio of the exhaust.