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"Service Engine Soon"; 98 DeVille


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I have a warning light on saying "Service Engine Soon", and was trying to determine if an actual problem is causing that light to come on, or if it's more or less "scheduled" to come on at certain intervals.

Have gone through the current codes, and there is no indication of any engine problems. The car is slow to start sometimes and idles a bit rough to begin, then drives normal within a minute or two. Other than that, no detectable issues.

Any input appreciated. Thanks.

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Post your codes both current and history, something is turning on the check engine light, maybe a misfire, its not a scheduled light

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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