Question about 1991 Cadillac DeVille
While driving, the "Change Oil Soon" Light on my '91 deVille flashes, and the fuel data center cycles, resetting the average and instant fuel economy. It will do this a couple minutes and stop. The oil was changed about two weeks ago and I reset the oil life monitor
Check your owners book, its a comination push of reset and average buttons on the fuel display.
Posted on Feb 24, 2010
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Posted on Jan 02, 2017
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Cadillac DeVille, Fleetwood, 1991 -93
When "CHANGE OIL SOON" light is illuminated, press and hold Range (A) and Reset (B) buttons on Fuel Data center 5 to 60 seconds. When buttons are released, the light will flash four times if it has been reset. If the light comes back on for more than 5 seconds, repeat procedure.
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