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the 02 sensors are in the exhaust system, screwed into exhaust like a spark plug. it is your upstream sensor. to change the sensors, first remove the wire to it, get a 02 sensor socket from the auto parts store. use the rachet and socket to take it out. good-day !
Have you had the engine control computer scanned for fault codes that might explain what this is? Do that first. You will need to buy a code reader for a OBD2 electronic engine control system, the diagnostic connector is in front of the driver under the dash.
the most common problem is driving with the gas cap off or loose. If this is your problem then tighten the gas cap and drive as usual. The light will go out on its own in a few days. If this is not your problem then you will have to have the cars computer codes read. Some auto parts store will hook up a reader to your cars computer and give you a read out for free. Other wise you will have to buy a code reader or take it to a mechanic.
I have this model Saturn (2003 LW300), and bought a code reader off Ebay. Make sure it is a compatible "OBD2" type, and plug is seated firmly with ignition switch off. Then turn on ignition without starting car. Press "Enter" or something on reader to start it and it should work.
HI there....Check to see if the code reader is a CAN OBD 2 code reader. If it is only OBD2 , that may be the problem. In 2003 Some vehicle manufacturers ( ford,Gm,Mazda and Saab) began using a new computer protocol called Controller Area Network (CAN) with the OBD2 and if your vehicle is CAN OBD 2 the simple OBD2 code reader will not work.Contact your local dealer to determine if you vehicle is CAN or not or find a code reader that is CAN OBD2 capable. Hope this helps you out