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what was the freeze frame data associated with the DTC? This info is very helpful for troubleshooting

I wouldn't concern myself too much with the EGR or maf readings, probably just seeing the normal stuff for an "EGR delete" tune. You are correct in that 100% duty cycle is 0% egr flow. This is a little counter-intuitive, but it's the way it works for EDC16 PD cars.

Actual AND specified over 800 at idle? that is high. If only specified, no worries. Otherwise, does not sound right.
 
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