2006 chevrolet cobalt ss 2.4L non supercharged troubleshoot "code PO128"?

Matthew Tait

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i drove to vancouver end of aug and drove back up as i reached vanderhoof my fan started to stay on constant after i had the engine started and the service light came on i was wonderin if anyone can help me with the code i got? the engines still runnning perfectly fine but im just gettin annoyed with the fan when im stopped its so loud thanks
 
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