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Why does the chassis make a crackling sound after the car is turned off?

1 Answers
DiVincent
07/25/25 10:16am
After the car is turned off, the crackling sound from the chassis is caused by the cooling of the exhaust pipe's three-way catalytic converter, which produces the sound due to thermal expansion and contraction. This is a normal phenomenon and nothing to worry about. The three-way catalytic converter is a crucial purification device in the exhaust system. Its main function is to convert the three harmful substances—CO, HC, and NOx—into harmless substances. Here are some details about the three-way catalytic converter: 1. Composition: The three-way catalytic converter contains platinum, rhodium, and palladium. 2. Functions of each element: Platinum, rhodium, and palladium effectively catalyze nitrogen oxides and particulate matter in the exhaust, so vehicles equipped with a three-way catalytic converter have much less noticeable exhaust odor.
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