How can I turn of my check engine light on my 1998 Nissan altima?

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as long as you corrected the problem, this is the home mechanics way of clearing most nissan trouble codes. i had a 98 altima and did this many times.

one the floor on the driverside by the pedals, kinda behind the radio. you will see a black trim piece covering the ecu. take that panel down. you will see a what looks like a flat head screw in the ecu. turn it clockwise till it stops, wait 2 seconds, then turn back counterclockwise. start the car. the light will be off, as long as all problems were corrected....Show more

One thing to keep in mind with "cel" or "check engine lights" - is this - they only indicate that there is a problem in a particular "circuit". if for instance - you take the car to Autozone and have them diagnose the cel with the scantool and it comes back as" map sensor error". Then it merely indicates a problem in the map sensor circuit. It in no way means that the map sensor is absolutely the problem - only that the problem is in the map sensor circuit.
You will still have to diagnose the circuit itself as to whether the sensor is bad - there is a bad wire in the circuit - there is a bad resistor inside the "ecu - engine control unit" . its not as simple as just changing the map sensor - and thats why your dealer gets his $80 - $100 an hour rate - for the proper diagnosis. Not simply replacing a part and hoping!!! That its the right guess....Show more

By fixing the problem. Your check engine light means something needs to be fixed or changed out. Once you do it, it will go away. ...Show more

you can try disconnecting the battery for a few seconds,,that should reset the computer..if the light goes out and comes back on a bit later then you have a problem,,,,...Show more

Go to autozone they can hook up a tool and give you the code your throwing and possibly turn it off. ...Show more