Visual inspection
Check the catalytic converter for damage while driving and for overheating. After the vehicle is lifted, observe whether the surface of the catalytic converter is dented. If there are obvious dents and scratches, the carrier of the catalytic converter may be damaged. Observe whether there are severe faded spots or slight traces of cyan and purple on the catalytic converter housing, and whether there are very obvious dark gray spots in the center of the catalytic converter shield, if so, the catalytic converter has been overheated. , further inspection is required.
Knock and shake the catalytic converter with your fist. If you hear the sound of moving objects, it means that the internal catalyst carrier is broken and the catalytic converter needs to be replaced. At the same time, check whether the catalytic converter has cracks, whether the connections are firm, and whether there are leaks in various conduits. If there is, it should be dealt with in time. This method is simple and effective, and can quickly check the mechanical failure of the catalytic converter.
Because the catalyst carrier is damaged and peeled off and the oil stains gather, it is easy to block the channel of the carrier and increase the flow resistance. At this time, it can be checked by measuring its pressure loss.