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Discussion Starter · #1 ·
I have a CEL for po128 and have wondered whether i need to replace a thermostat or coolant temperature sensor. I originally thought i would need a new thermostat although the heater in the vehicle is working just fine. The only thing that I have noticed is the coolant temperature gauge has not gone up or goes up very little. I do not know what i should start with replacing as i have already checked the coolant level and it is fine.
 
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