30 miles..
There is one before and one after the catalytic converter.jd
4 degrees before top dead center.
They are located before and after the catalytic converters in the exhaust system.
There is one before the catalytic converter and one after.
There is one before and one after the catalytic converter.
Replace the pump before the serpentine belt and rack and pinion are damaged.
About 50 miles , however it can be as much as 250 This is to prevent you from resetting the ECU to pass an inspection , these miles will allow the sensors to reset and detect a problem.
No an emissions test will not affect the check engine light. However an emissions test cannot be performed while the check engine light is on, you will have to repair whatever is wrong with the vehicle before it can be done. Simply resetting it wont work either as the system will have to complete several (7 or 8) emissions readiness tests before it can be done and whatever is wrong will most likely reappear by then.
It will depend on the engine size. All will have 1 before the catalytic converter and 1 after each one.
Evidently the oil level was low before you changed oil and was full thereafter.
what engine do you have in your impala?
If you have had "one to many" then wait till you are sober before resetting your account.