Question about 2004 Cadillac Deville
You need to know what code is being stored as an error on your onboard computer. The easiest and least expensive way is to run by Autozone or Advance auto parts and let them hook the code reader to your car. There are so many different possibilities that it is not economically feasible to change parts until you get the right on by chance. So, find out what code your computer is showing, then repost on here with the code numnuber or numbers and you can get a better idea which parts need to be replaced. Also, it may take a week or two for your computer to analyze your system after it has been reset. It has to run through several cycles of stop and go, high speed and steady speeds before it will know if you fixed your problem. During that cycle time, it won't pass emissions even with the check engine light off. It will just tell the emissions people that not enough information is available.
Posted on Sep 30, 2010
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Posted on Jan 02, 2017
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