E46Fanatics - View Single Post - Service Engine Soon Light Came On... Reading a P0128 Code??
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Old 12-01-2008, 05:09 PM   #5
davidwarren
Halfway to 2L
 
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Join Date: May 2004
Location: louisville, ky
Posts: 2,505
My Ride: 2010 335i
the coolant system is not the strongest point in the e46.
At your mileage, I would recommend changing the water pump, thermostat, hoses and fluid. Check your expansion tank too. I personally have not had problems with the sensor, it is probably just the thermostat. The thermostat is likely just stuck open.

Change your stuff, then don't overfill the system, that's what generally causes a burst expansion tank. remember to bleed the air out.
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