This Sonata was towed in due to the MIL flashing and power loss. Retrieved code P1326 for excessive knock activity. I believe this vehicle has had the reprogramming done to enhance the knock sensor sensitivity in order to prevent catastrophic damage due to connecting rod failure. I believe the knock sensor may be picking up EMI from the injector circuits. I also found a bulletin recommending an OE oil filter. I replace the filter topped up the engine oil and cleard the code for now. I could not hear any engine noises. I will post a follow-up when or if the problem returns.

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