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Unknown part


I have a 2003 Mazda Tribute X. I dont know anything about cars and this part just busted on my car. Can any of you tell me what it is and how much it would be to get it replaced

That’s the EGR valve.

https://www.rockauto.com/en/moreinfo.php?pk=5642037&cc=1416866&jsn=367

Tester

How did it get busted?