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I have a 2006 Civic that I bought new three years back. Recently I hit a large pothole in the road due it being covered by rainwater. Immediately thereafter, I hear a metallic rattling coming from the forward section of the car(specifically under the hood) whenever I am running at 65mph+. It does not occur during high acceleration; just higher speeds and very repetitive(not dependent on bumps in the road).
Any idea what it might be?

 
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No, but I would think it would be prudent to take a look at the underside of the car, maybe put the one wheel up on the sidewalk and go under and eye ball it just for safe keeping's since you drive it fast.... better safe than sorry. Isn't it still on warranty ??