2003 Gmc Envoy Took Xl Advance Auto Because Check Engine Light Came On Tech

2003 GMC ENVOY
268,532 MILES
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I took my 2003 Envoy XL to Advance Auto because the check engine light came on. The Tech said that my problem was code # po128. What does code po128 mean and how much will it cost to fix.
Mar 23, 2013 at 1:01 AM
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