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Sadly, it seems to permanently store redlines... any dealer will know how many times you've redlined your engine. I do not think these can be deleted if I remember old posts on Renntech.
I do not know if the car's computer stores historal info on the CEL incidents, but it would not surprise me if it does. I do know that if a CE light comes on and then eventually goes off and you bring it to a service technician, he can tell you why it came on in the first place.
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