When my 1994 Cadillac Elderado's "Service Engine Soon", light is out when ignition switch is on (car not started) and on when engine is started. What is my problem?


Asked by Aug 05, 2016 at 02:25 PM about the 1994 Cadillac Eldorado Touring Coupe

Question type: Maintenance & Repair

When I turn the ignition switch to the on position, the "Service Engine Soon
", light sometimes flashes on, but quickly go out. When I turn the ignition
switch on and start the engine, the "Service Engine Soon", light comes on
and remain on. I replaced the old gas cap with a new and the problem
remain. The "Service Engine Soon" light, (according the maintenance
manual) should be on when the ignition switch is in aux position and the
engine not started.

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