Question about 2004 Saturn ION
O2 sensors can drift off with time and are only picked up as bad by the ECU when they are almost beyond redemption. The other area to look at is the temperature sensor. Sometimes this does not pick up on the engine getting hot and the ECU, seeing a 'cold' engine keeps the fuel mix rich, as if trying to warm the engine all the time.
Posted on Sep 09, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Insert the key into the ignition and turn it to the "ON" position. There is no need to start the car.
Press the button located in the center of the instrument cluster ONCE. The display should now read "OIL LIFE" instead of vehicle mileage.
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