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Old 08-30-2012, 06:59 PM   #1
325i'02
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Join Date: Nov 2011
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Help! SES code P0128.

Guys,
I have been reading around here for this code and i see that is indication the Tstat is stuck open. However, i dont have a change in the gas mileage, which should occur if the tstat is open.
Could this be a bad temperature sensor or is it really the Tstat that needs replacing?
Thanks.
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Old 08-30-2012, 11:42 PM   #2
94583
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Bad thermostat. You have to remember that the thermostat is electronically controlled. You wont see any decrease in fuel economy.
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