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Engine code po128

Did not pass Ill. EPA

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Change your thermostat, and while you are down there, suggest you change your coolant temp senor too Engine is running too cold (rich)

Posted on May 02, 2014

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Pontiac grand am I had a diagnostic reading at autozone for diagnostic codes po128,po440 and p1189 don't know what they mean for a 2003 Pontiac grand am gt 3.4 liter and v6 engine vehical


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PO 128 is a coolant temperature beyond threshold code. It means your thermostat is stuck and needs to be replaced.

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My check engine light is on and I can't pass inspection because of this problem. The code that appears is po128. What exactly does that mean?


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