A 1992 Regency has an OBD I system. The easiest way to reset a service engine soon light is to disconnect the battery and leave it disconnected for a minute or two. You will lose all of your radio presets though.
CAUTION: Make sure that the problem is fixed before you reset the light because it will probably come back on.
To reset the "Service Engine Soon" light on a 1992 Regency Oldsmobile, you can first disconnect the negative battery terminal for about 10 to 15 minutes. This will clear the engine codes and reset the light. Alternatively, if you have access to an OBD-I scanner, you can use it to read and clear the trouble codes, which will also turn off the light. After resetting, ensure that any underlying issues are addressed to prevent the light from coming back on.
reset service engine light
A reset Engine Service Light comes on when an issue comes up with in the engine. This light can be reset by a tech or by fixing the problem.
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There are a couple of ways to reset the Service Engine Soon light on a Suzuki Grand Vitara. The easiest way is to get a scan tool from your local auto parts store. Using the scan tool will reset the service engine light. Disconnecting your vehicle's battery is another way that often works to reset the Service Engine Soon light.
The service engine light has to be reset with a scanner. Disconnecting the battery will not work. The light will come back on unless you make the necessary repairs.
The service engine or check engine light can be reset with a scan tool or by unhooking the battery. The light will return if the failure that caused the code is not repaired.