Clogged catalytic converter symptoms are worth paying attention to and if they are spotted early, fixing them can save you money.
1 - Poor Power Levels
The exhaust system uses the catalytic converter to operate properly. The converter must be free of any blockage so that exhaust can pass through the system easily. A clogged converter backs up the pressure of the exhaust and forces the engine to work harder which leads to erratic engine idling and stalling. The power will weaken and the engine will run at higher temperature levels. A vehicle that suddenly loses power could be experiencing a clogged catalytic converter.
2 - Decreased Miles Per Gallon Levels
A clogged catalytic converter forces the engine to work harder and decreases the gas mileage. The exhaust is forced out of a smaller hole and negatively affects the miles per gallon of gasoline attained by the operation of the engine.
3 - Excessive Noise Levels
A clogged catalytic converter can also become broken. The inside structure of the converter can crack and negatively affect the passage of the exhaust. A crack in the converter can cause rattling and vibrating noises when the gas pedal is pressed. You can check for evidence of broken converter by shaking it by hand and listening for noises. Make sure the exhaust has cooled completely before you attempt to touch it to prevent any serious burns.