What does service emission mean on a 1996 cadillac sedan deville

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

If when you push auto it goes to econ that normally means you are low on freon.

If the a/c does not engage as a result of the electronic control system in your 1996 Cadillac, the climate control system may need to be replaced.

However, if the problem is being caused by low charge of R134a in the system, have the system charged before changing that electronic part.

I have never seen a Cadillac Climate Control System do this, which leads me to believe that it may be more electronic than refrigerant pressure related.

If the refrigerant pressure was low in the system, the climate control system should still stay on 'auto' mode, I think, and simply blow warm air.

located underneath the intake manifold remove it and disconnect the knock sensor unscrew the knock sensor. installation is reverse

I would suggest checking your Oxygen sensor which will light up your service emission light. Check that and let me know Good luck

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...

Under vehicle, driver side, below seating area, front of fuel tank, mounted on chassis in fuel lin.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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.

Firing order 1-2-7-3-4-5-6-8 ..............1-3-5-7 back of engine near fire wall...........2-4-6-8 front of near radiator

have your plugs been changed,sounds like a wire may be crossed