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Join Date: May 2006
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New CSF 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

Last edited by Das86TurboII; 12-28-2018 at 09:04 AM..
Old 12-06-2018, 06:41 AM
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Join Date: Dec 2018
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Hello,

I was curious if you've had any luck figuring this out? I have the same issue with my e90. I've changed the thermostat and the temp sensors but no luck. Mine will get to operating temperature as long as the heater is off. As soon as I turn it on, I can watch the coolant temp drop on my scan tool by about 35 to 40 degrees. I would agree with you that something is telling the thermostat to open. No problem above 40 degrees.

Thanks in advance.

FRS330XI
Old 12-27-2018, 04:26 PM
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I have not. My next step is to replace the level sensor in the expansion tank, re-bleed the system. Goal - get rid of the “coolant low” alert and see if that changes things. I’ve been told by an Indy “the thermostats fail all the time in the open position. We can replace it...”. I don’t buy that explanation. If that were the case, the thermostat was stuck open, at Higher ambient temperatures, the system wouldn’t maintain a consistent temp. I’ll let you know what the results from my next sensor replacement. Are you getting the coolant level alert also?
Old 12-28-2018, 09:13 AM
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I am not getting any coolant level alerts. I had a few thermostat codes pop up even after changing it to a new one (Non OEM) but they haven't come back since I cleared them. I agree with you that if it was a thermostat issue, the coolant temp issue would be an issue all the time. I'm keying on a sensor somewhere but just don't know where to look since the system is so sophisticated. I did take it to a BMW service center and had them scan the entire system which produced nothing but a $150.00 service bill! I was considering changing out the ambient temp sensor since it seems like it might be related somehow and its fairly cheap. Thoughts??

Thanks
Old 12-29-2018, 06:40 AM
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