Last night the Service Engine Soon light came back on again. And all the while I was hoping it would have been solved with something as simple as the spark plugs...
However, I took the car by Auto Zone and had them run their free "check engine" diagnostic test on it. Came up with error P0133 which is a "slow response" from the oxygen sensor in bank 1. What that means is that the sensor isn't reading correctly and therefore is sending bad signals to the car's computer. Fortunately for me the sensor is located right up front and is easily accessible and changed. $21 later I've got a new sensor and, hopefully, no more Service Engine Soon issues--a few days will tell.
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