Loud engine rattle on cold start (video included)

[gtacivey]

Anyone know whats going on here? This piece (tensioner?) is rattling on engine start

2015 civic sedan

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[Hervacationhome]

The bearing on the tensioner might be going out. Slip the belt off of the any easiest accessible pulley and spin the tensioner by hand. If it makes the sound, then bingo.