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General E46 Forum
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Old 04-28-2005, 01:07 PM   #1
wyu
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Angry P0128 SES code

I received a ServiceEngineSoon light 2 weeks ago. It came back as a P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) error. I reset the SES and kept an eye on my temperature gauge while driving to make sure the car wasn't underheating/overheating. The temperature gauge acted fine and I didn't experience any problems. Then the other day, the SES light came on again with the same error code. Any ideas what could be causing this? I've also done a coolant flush and coolant bleeding about a month ago, would this have anything to do with it (maybe airbubble or something).

Should I swap out my thermostat just in case, maybe its starting to fail?

Thanks
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Old 04-28-2005, 01:17 PM   #2
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Change your thermostat... It is a common SES and CEL cause for e46's...

I've changed mine twice...
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Old 04-28-2005, 02:23 PM   #3
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Change Thermostat...

, just did mine several months ago.

What became apparent to me, was my car did not reach optimum operating temp (arrow straight up) in the normal amount of time or miles.

Replaced the thermostat and walla, back to normal
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Old 04-28-2005, 02:28 PM   #4
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Thats the very strange thing about my situation. Car heats up fine (witin 5 mins its in the center) and it never moves any higher. Anyways, I have the thermostat at home. I'll DIY this weekend and let you guys know how it goes!
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Old 04-28-2005, 04:07 PM   #5
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Should only take you about 10 minutes...
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Old 05-14-2005, 04:58 PM   #6
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UPDATE: its been a week and no SES lights anymore. Replacing thermostat fixed the problem. Remember to bleed the air out of the system when you are done.
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Old 11-09-2005, 04:13 PM   #7
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Anyone have a good DIY for this? I have to change mine too. Also, do i need anything else besides the thermostat?

how do you bleed the air out of the system?
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Old 11-09-2005, 04:36 PM   #8
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This link will show you how to bleed the system.
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