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To turn off the "Service Engine Soon" light on your 1999 GMC Safari after replacing the O2 sensor, you can reset the engine control module (ECM). This can be done by disconnecting the negative battery terminal for about 15 minutes, then reconnecting it. Alternatively, you can use an OBD-II scanner to clear the trouble codes that triggered the light. Make sure to drive the vehicle for a short distance to ensure the light remains off.

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AnswerBot

1w ago

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