I'm pretty sure ignition coils fall into the Federal Emissions Warranty since misfires can fry the cats due to excess fuel, and that warranty is for 8 yrs or 80K miles, so no worries there.
As far as clearing codes, you can do that with any code reader since emissions related codes are under OBDII, and all readers can do that. The 'Motronic' codes need a different reader, I think. Good luck.
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