What is the box next to the muffler?

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On a 2004 Matrix XRS, what is the rectangular plastic box between the muffler and the gas tank? Mine partially broke when I hit something and now I have strange varying idle noises. The car still runs fine otherwise...

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Hi...welcome to the Forum

It sounds like it could be a Fuel Vapour cannister (EVAP system) so if you are getting a smell of fuel and its affecting the idle speed then chances are that is what it is

Worth dropping into a garage to confirm and let us know what you find

Cheers,   Trevor

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