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A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Maybe the muffler is bad.
YES
Damage. Hole. Perished gasket. Incorrectly fitted. Corrosion.
Because of condensation the inside of your muffler, the muffler will begin to deteriorate (rust) over time from the inside. This can and will cause holes in the muffler. Along with the hole (s) the internal structure of the muffler will eventually break apart and plug the muffler, preventing the exhaust gas and the pressure from the engine from exiting the vehicle. This will cause what is called "back pressure" on the engine, causing it to lose power. Extreme example would be "you push the gas pedal to the floor but the car will not go more the 25 miles per hour". I would recommend you have you muffler replace. That should solve your problem.
Not likely. But you know you have a hole in your muffler so unless you want to have an accident from carbon monoxide poisoning you should have it replaced ASAP. Then reset the light and if it does not come back on, you know that was the cause.
A buildup of raw fuel in the exhaust system is then ignited and damages the exhaust muffler or blows a pipe apart.
loose baffle
No. It will cause a problem with both back pressure and noise.
THATS usally cause by the engine using oil-because of bad oil rings etc.
In world war one all tanks upgraded to muffler bearing. The exhausted would leak and cause the engine to lose compresion and flood muffler bearings stop that
if is the 2.3l, only when started the car,its the supercharged seal to will be replaced. Just'n Style