I am now sure that it is. I went to diagnosticdialog.com and entered it, and this is what came up.
Diagnostic Trouble Code Description
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Trouble Code: P1131
Vehicle Qualification: Ford Contour
Description: Lack of HO2S Bank 1 Sensor 1 Switches - Sensor at Lean Limit
I don't have a clue though, as to where it is or how to replace it, i never did.
