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Join Date: May 2006
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New CDF radiator, WP & thermo: P0128 Thermostat Code - Car won't warm / New radiator

I recently upgraded to a CSF Radiator, at the same time replaced the WP and Thermostat. Now, I'm getting a P0128 OBD error. On cold days, below 40 the engine doesn't get above 180 deg. On a hot day the temp gauge stays right in the middle, ~250 where it should be. So the system is trying to maintain temp. At the same time I'm getting a "check coolant" level alert. The coolant level is fine. I conclude the level sensor is bad an needs to be replaced. With the car running "cooler", the heater doesn't push hot air into the cabin. The obvious conclusion is the thermostat is stuck open. But, given the car maintains temps on hot days, the thermostat is changing position to maintain temps.

Questions:
1) Do I need to program / configure to recognize the increased cooling of the CSF radiator. I'm hoping to avoid replacing the thermo. Getting back in their is a PITA.
2) Could the level sensor be a factor

Any other ideas?

TIA
Old 12-06-2018, 07:41 AM
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