If the engine knock is coming from deep inside the engine, the I agree, the rod is knocking.
If the sound is coming from closer to the top, it could be a valve lifter or push rod you are hearing. This isn't as bad, they last longer and synthetic oil or oil treatment helps.
If this doesn't happen all the time, if it's occasional or you hear a pinging noise, you could just have a bad knock sensor.
Look for a bulletin on that on the National highway safety admin. website, I thought I saw something like that earlier this morning...
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