Question about 2004 Saturn ION

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I bought 04 saturn Ion 2.2 sedan with 150k miles, runs great, however has really bad mileage problem - only 18 to 20mpg. What could be the problem? Plugs - injectors - O2 Senser - Air/fuel filter or all of the above. Can plugs cause this only. Confused!

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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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I just had my oil changed on my 2005 Saturn ION and now i get the 'chng oil' alert. what should i do?

  • Insert the key into the ignition and turn it to the "ON" position. There is no need to start the caricon1.png.

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    Press the button located in the center of the instrument cluster ONCE. The display should now read "OIL LIFE" instead of vehicleicon1.png mileage.

  • Read more: How to Reset the oil life monitor on a Saturn Ion '

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