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Q: How can I reset the "Service Engine Soon Light" on 1997 Oldsmobile Cutlass Supreme

How can I reset the "Service Engine Soon" light ? I disconnected the Air Flow Sensors and started the car several times while I was working on it. The repairs are finished and the "Sensors" have been reconnected. However,
the "Service Engine Soon" light stays on after the car is started.
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after it passes its internal tests 3 times, it will reset itself. if it persistes, then there is a problem. it could take up to a few days before it will clear.
you can try removing the negative cable for about 10 seconds but that may or may not clear the code.

Roy
Very GOOD Guys !! Just as you said, the "Service Engine Soon" light turned itself off after one (1) day. Thanks ever so much for the help.
Garageman
turn the key on without starting,press the excelerator all the way to the floor 3 times.the light should go off.
I have 1997 Dodge Grand Caravan. I have had the engine tune up, changed the upper sensor, egr valve still service engine soon light stays on
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