service vehicle soon lite on 2001 Oldsmobile Intrigue

how do I clear codes?trouble started with key left on @ battery run all way down.abs@ trac off lites on intermitting.never had problem till batt.

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1 answer
You can disconnect the Battery NEGATIVE cable for 1 minute. That will do the trick. If the "Service Engine Soon" light comes back on, then you have a real issue that needs further attention i.e have the codes retrieved and diagnosed.