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Contact our Chevy Customer Care account via Private Message and provide them this information. I suspect that the real issue is they didn't get something tightened down properly when they replace the camshaft cover, causing a vacuum leak. Your symptoms match the PCV valve issue, which require the cam cover be replaced.
 

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Premium Member
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25,595 Posts
On the gray bar near the top of the page, click Private Messages. The menu on the right will contain "Send" or something similar. Start typing Chevy Customer Care into the "To:" box and select them when they come up. Chevy Customer Care is staffed by GM HQ employees who have been very good over the years at getting dealerships to take the time to fix things right.

Also, an O2 sensor alert is frequently what's known as a "cascade failure" in that it's not the real cause, but just a symptom. I'm guessing there's a P0171 code stored in your ECU - this points directly at a vacuum leak.
 
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