I got a code 55 today. Now what?

[billschroeder5842]

I got a Code 55 today during a bit of "spirited" driving today.

The SES light cam on after a run up to 7k. The car ran great and I noticed no performance issues. I drove the car with no iproblem to my next stop and when I restarted, the SES was absent from the DIC.

I checked the code when I got home and got a 55..."detected a lean oxygen sensor voltage for 2 seconds during the power enrichment modes of operation."

Was this a momentary LOS (loss of Sh*t) or bigger problems? My research can't find anything specific about a 55 but I'm thinking it has to due with the secondaries?

Any help is appreciated!