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I brought my 2016.5 Cruze in 1 week ago for my second po15 b CEL. They didn't replace an O2 sensor this time but they did reprogram the ECU. So it looks like the long awaited update is out. I'm not sure what it changes. The only thing I noticed was that my auto-transmission seemed to have been reset and had to relearn my driving habits. I shifted weird at first but is back to normal for me.

For what it's worth I fill up with Shell V-Power and engine seems to run great except for a few instances where the engine was lugging in high gear/low RPMs. The lugging hasnt occured for me since the ECU update. It hasn't been long enough to tell if the shifting algorithm has been changed though.
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