First, you should do a visual inspection of the catalytic converter. If there is any visible damage or blockage near the exhaust pipe, this could indicate that the catalytic converter is clogged. Next, you can perform a vacuum test to check for back pressure. To do this, you need an adaptor hose and vacuum gauge connected to the exhaust pipe of your vehicle. Then, you should check for any sudden drops in pressure that could indicate a clogged catalytic converter. Finally, an oxygen sensor test can be performed to measure the amount of oxygen present in the exhaust stream. If there is too little or too much oxygen present, this can indicate a clogged catalytic converter that needs to be replaced. If any of these tests indicate a clogged catalytic converter, you should consult with an automotive technician for further diagnosis and repair. It is important to address this issue quickly as it could cause damage to your vehicle if left unchecked. By performing these simple tests, you can detect whether or not your catalytic converter is clogged and take the necessary steps to fix the issue.