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Q:

What is causing a rattling sound coming from the exhaust pipe on 2002 Buick Rendezvous

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
It's mainly at start up and take off
(1) Answer
Catalytic converter may be broken inside... Hit it with rubber hammer to test!