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i bought a 2011 Cruze with a bad head gasket a few months ago. Head Gasket is fixed and I installed the V3 PCV fix. The PCV valve was gone. Car has 140k miles. Codes can be cleared with scanner but they seem to come right back after driving 10-15 miles. Any suggestions on what to look at next? Replace Map sensor?
 

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I have some of the same codes appearing on my 2014. I need to replace my pcv valve soon but I think my mass flow sensor has an issue. From reading it sound like GM combined the sensor with a temperature sensor. The mass A flow sensor is reliable but I think the temperature side is not so reliable. Scan tool states it has a higher chance of going bad, look at the iat - intake temps on scan tool if it is not correct that could be the issue.
 
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