That 92% number; is it a fixed value or does it vary? If it's fixed, it's an error code but I don't remember what 90% error code means.

The 49% reading when the O2 sensor was disconnected was because the KE system was not operating.

Check and see what the O2 sensor is putting out. It should vary .5 to 1 volt.

The O2 sensor should be operating and sending info well before 80c.

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2012 E350
2006 Callaway SC560