Caddy88 Posted November 22, 2014 Report Share Posted November 22, 2014 Eldorado 1998 Service engine soon is on, no other messages. Ive found several guides how to check the code on different kind of cadillacs, but not 1998 Eldorado. Can someone please tell me how I check whats wrong? Thanks Link to comment Share on other sites More sharing options...
Cadillac Jim Posted November 27, 2014 Report Share Posted November 27, 2014 Turn the key on, then press <Off> and <Pass Warmer> on the A/C buttons together for a few seconds until all the dash lights come on like you just turned on the key. Then, release both of them. The car's computers will go into the diagnostic mode and will poll the modules, one at a time, and display the codes on the dashboard message panel. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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