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I have a 2014 Sonata. Had the engine replaced last year from class action recall. A few months later I started hearing a growling noise when I accelerate in lower gear. I thought it was the muffler but when I brought it into the dealer, they said it was the tensioner, and they replaced it ($800+). But that didn't resolve the problem. Growling noise seems to be getting worse now. Any thoughts?
 

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Have the dealer check motor/transmission mounts as well. It could be they are getting a little worn. I had a wicked rattle after my motor replacement in May/June and it turned out that both my motor and transmission mounts were bad. I am also dealing with the growl at low gear RPM now (pretty sure it's the tensioner as well, thanks for the rough estimate on cost!) but definitely check on the mounts.
 
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