what does code po137 mean when the van is idling high on 2004 Chevrolet Express 3500

when you start the van it idles very high continuous. code po137.

by in Edmond, OK on July 09, 2013
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2 answers
ANSWER by , July 09, 2013
Possible vacuum leak causing increased engin rpm @ idle. Code PO137= downstream (behind cat. conv.) O2 sensor or it's circuits problem. Have a mechanic perform scan test to confirm!
ANSWER by , July 09, 2013
agree with #1