What causes the exhaust pipe of a BMW X3 to make abnormal noises after parking?

[AthenaAnn]

There are many reasons for the exhaust pipe to make a popping noise, mainly including exhaust pipe aging, malfunction of the car's three-way catalytic converter, issues with the car's ignition system, and abnormal concentration of combustible mixed gas. Exhaust pipe aging: When a car is too old, the exhaust pipe is prone to aging problems, which can lead to loosening, detachment, or holes, ultimately causing abnormal noises from the exhaust pipe. This situation is relatively simple to resolve; it only requires re-securing or replacing the exhaust pipe. Car three-way catalytic converter malfunction: If the car's three-way catalytic converter malfunctions, it cannot properly purify exhaust gases, leading to blockages and pressure inside, which causes abnormal noises from the exhaust pipe. In this case, it is necessary to visit a repair shop or a 4S store for professional inspection and repair.