How do I get check engine light to go off

Asked by kathyjsmith Dec 11, 2016 at 03:01 PM about the 2003 Saturn ION 3 Coupe

Question type: Maintenance & Repair

I had a code PO128 I replaced coolant sensor and thermostat and refilled coolant I disconnected the battery cable to try to reset the check engine light but it still stays on.

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