No, but it will make a sucking type sound.
Yes
No. A catalytic converter wont. If its a rear wheel drive, check your drive shaft. Front Wheel drive, CV Joints. Other than that worn steering. Exhaust wont cause this issue.
Catalytic converters do not rattle. If it does it will need to be replaced as it may block the exhaust. Loose heat shield?
Yes, it can affect the oxygen sensors and catalytic converter.Yes, it can affect the oxygen sensors and catalytic converter.
A bad catalytic converter will cause a severely restricted exhaust system. You would notice a lack of power and performance from you vehicle and in cases of a completely blocked converter, the engine may not run.
Probable cause is exhaust restriction, possible plugged catalytic converter.
Check the heat shield on the catalytic converter Check exhaust hangers
Depending on the vehicle, it could damage the catalytic converter over time.
if catalictic converter or any other part of the exhaust is clogged, it will cause engine to bog and die.exhaust needs to be clear to allow exhaust gases to escape
Typically, no, it cannot. If you have a clog in your exhaust 9 times out of 10 it is in the catalytic converter. The muffler can also collapse inside and cause clogs.
I believe 0421 is a catalytic converter inefficiency code which is usually caused by a bad o2 sensor or a bad catalytic converter, but I have also seen fouled plugs and exhaust leaks cause this code.
Probably a restricted exhaust problem.I'd bet it's your catalytic converter.