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You would have to have a scan tool hooked up to answer the o2 question. Not all vehicle parameters are written the same.
If you make the egr stay on it will run like garbage at idle. Again most manufacturer parameters are different but egr generally only activates a. When revved up at idle b. when you are down the road at a constant speed and throttle position or c. When you are decelerating after a cruise or high load condition. It will not be a lean burn mode.
Only way to make a true lean burn condition is to custom tune the ecu so it runs high afrs
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Burn lean and prosper \\ //
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