Thread: SES P0128
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      12-07-2010, 12:19 AM   #1
ForTheD
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Drives: 2007 e90 335i 6MT (ZSP)
Join Date: Aug 2010
Location: Salem, OR

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2007 BMW 335i  [0.00]
SES P0128

So I had the SES light pop on a few weeks ago, check it, P0128 (Coolant Thermostat Malfunction), erase it.
It comes back about 6 days later.
The car is acting just as normal including the heater and the engine response.
I have owned this car for the last 6k miles, and the temp always takes about 10 to 15 minutes to get to 220 or so, and there seems to be no change there.

Searching around I did not find a concrete fix for it, other then a the one person I saw replace the thermostat. This seems a bit extreme so I wanted to see what you all thought.

Is there a separate sensor somewhere?

p.s. I'm not taking it to the dealership. out of warranty and I like doing this stuff my self (with the help of the forum of course.

Thanks everyone.
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