Shift in the Demand Curve. A shift in the demand curve occurs when the whole demand curve moves to the right or left. For example, an increase in income would mean people can afford to buy more widgets even at the same price.
Once they fail they can do massive damage like I've described above. Clogged catalytic converters cause the engine to stop running all together, or at the very least you would notice that the engine would no longer rev or accelerate the vehicle (lack of power). Customer: replied 7 years ago.
Destroying a Catalytic Converter. Both of these issues will turn on a check engine light and if ignored will damage the cat. Or if the check engine light has been on for some time before and ignored then you will never know that there is an underlying fuel management issue and you will damage the cat.