When an oxygen sensor goes bad a car will burn gas at a higher than normal rate because it will not be producing as much power as before. The oxygen sensor checks the amount of exhaust.
the car won't start
It breaks.
When a thermostat goes bad in a vehicle, it can make your car overheat. It can also make it t where you do not have any heat inside your car.
BAD
A headache or worse.
no. when a head gasket is bad coolant goes to the exhaust pipe and causes the car to smoke alot all white smoke.
What can cause black sooty exhaust is bad valve guides. When the guides are bad oil leaks into the cylinder when the car isn't running. When the car starts it produces black exhaust.
car stalls backfires hard to start
car will not start up
Yes, that could be one of the causes. With a bad or going bad Cataylic Converter the car will start to lose power and get hot. What happens is that the exhaust is starting to get blocked. Something like putting a partial potato up an exhaust.
A car that has a bad exhaust flex pipe will not pass inspection in any state that requires it. The pipe will need to be fixed before the car is inspected or it will fail.