I had some LOUD knocking coming from the engine a couple months ago. I took it to the dealer immediately and they couldn't put their finger on the problem. They took it for a few test drives and the problem apparently fixed itself they said. They also mentioned the CEL flashed and they said it was due a cylinder misfiring. to They said is was more than likely a tappet issue..maybe it was something else though? I got the car back and it hasn't come back yet. I have my fingers crossed!
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