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Once you remove your piggy tune... (or when every your battery is changed or DME removed) you will need to drive the car a few hundred kms/miles before you will see the DME in ready mode. There is no way around that. You just need to drive the car under varying conditions before your DME is in "ready mode".
Most OBD-II scan tools will show you when you get all "five" ready modes checked. I think you only need three out of the five to pass. I just remember you do not need all ready modes - just most of them to pass state inspections.
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