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Hello, my name is***** there is oil getting onto the oxygen sensor then that will cause the reading to be off. The sensor needs to be able to have a good external oxygen reading to be able to compare the exhaust to. If it has oil on it then it needs to be replaced with a Denso sensor. Once that is done and the codes are reset the sensor can be checked with a scan tool or you can just see if the light stays off. If you need more help please let me know.