Emission problem 1996 sedan deville

The cadillac are sensitve to oveheating,once it overheats you basically have a headgasket problem

You might have to go to a Cadillac dealership to get it reset. Some sections of the computer are locked out so only the manufacturer can fix it.

Maybe loose fuel cap. Tighten and see if it comes on again. If it does take it to autoparts store and get a free OBD scan.

hard to know if you dont have a scanner to read code. i would suggest making sure gas cap is on tightly this in the number one problem that makes these lights come on.it could be anumber of things these are emmission related problems for light o2 sensor,clogged catalytic convertor,car may need tune up.change oil,fluid levels,spark plugs,air filter.fuel filter idle air control valve and the list goes on but make sure gas cap is on tight and drive for a couple of miles and see if it turns off..

you need 2 replace your oxygen censor and check your evap for any leaks

This means something is wrong. The next step is to pull the error codes, from the computer. DO NOT let this condition continue, as other damage may occur. Any incorrect emission issue exposed your converter to damage...

it means theres a emission component thats not working. may be a air pump valve if it has one, or a vent valve youll have to scan to figure out good luck.

Yes you can. 2000 Cadillac should have a northstar already in it.

U will very seldom feel any difference when this light comes on, it comes on when one or more of about 200 electronic faults has occured in the electronic controls and sensors of the computer controled systems, these systems are the engine the transmission and the emission control system, you will need to have the system tested to see what code or codes is stored in the computers memory.

That will not pass a PA state emission inspection. Don't know what state your in. Take the car to Auto Zone and they will read the trouble code for free. They will let you know what part probably needs to be replaced. You can then buy the part and do-it-yourself or take it to a mechanic knowing what is most likely wrong with it.