Hey Scotty i have a nissan altima 2008 and it makes a loud clunk noise that seems to be coming out…

Hey Scotty i have a nissan altima 2008 and it makes a loud clunk noise that seems to be coming out of the bottom of the car it happens when lets say youre at a red light or.your car is idle and it even happens minutes after you shut off the car what can it be ?

if you hear it minutes after you shut off the car, odds are it's the catalytic converter substrate breaking down inside and clunking. Nothing else really makes a noise just sitting there. Heat makes it expand and contract

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