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Your information is vague. You didn’t indicate where you saw sparks flying from. Nonetheless, a simple and common sense approach should steer you in the right direction.
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If it’s happening at the receptacle…and the condition of the oven’s plug is good, try plugging it into a different outlet. If all is well, then call a licensed electrician to repair the receptacle. If sparks STILL fly, then call a service company to repair the oven.