Replaced the Thermostat Twice and Still Getting P0128 Code, PLEASE HELP!!

Captainjz16 · 10-25-2016, 09:00 AM

Here's the back story. 2006 e90 325i. I've replaced the following parts:

Radiator
Expansion Tank
Coolant Temperature Sensor
Thermostat...twice. First time with a Wahler brand. The second was a Mahle.

I've done the purging procedure after each install. Delete the code and then after a few months, it comes back. I'm definitely getting some unique sounds from the engine bay.

Any ideas why??

max_330i · 10-25-2016, 07:04 PM

I also have a recurring P0128 code in my car. It is worse when it is cold outside; my understanding is that the SES code is triggered when the car does not warm up fast enough. Did you do the water pump while you were doing the t-stats? One coolant temperature sensor or both?

Captainjz16 · 10-27-2016, 03:41 PM

water pump and thermostat both replaced in 2013. i replaced the thermostat again in 2015 and 2016.

PhaseP · 10-27-2016, 08:55 PM

There are two coolant temperature sensors on the car, one is close to the oil filter housing, the other one is right up the radiator on the passenger side, at the junction where a coolant hose goes into the radiator. Did you replace both?

10-25-2016, 09:00 AM	#1
Captainjz16 Registered 0 Rep 4 Posts Drives: 2006 E90 Join Date: Oct 2015 Location: Florida iTrader: (0)	Replaced the Thermostat Twice and Still Getting P0128 Code, PLEASE HELP!! Here's the back story. 2006 e90 325i. I've replaced the following parts: Radiator Expansion Tank Coolant Temperature Sensor Thermostat...twice. First time with a Wahler brand. The second was a Mahle. I've done the purging procedure after each install. Delete the code and then after a few months, it comes back. I'm definitely getting some unique sounds from the engine bay. Any ideas why?? Last edited by Captainjz16; 10-25-2016 at 09:09 AM.. Reason: typo
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10-25-2016, 07:04 PM	#2
max_330i Captain 340 Rep 922 Posts Drives: 2006 BMW 330i Join Date: Apr 2016 Location: Illinois iTrader: (0)	I also have a recurring P0128 code in my car. It is worse when it is cold outside; my understanding is that the SES code is triggered when the car does not warm up fast enough. Did you do the water pump while you were doing the t-stats? One coolant temperature sensor or both? __________________ 2006 330i 6MT Jet Black / Black
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10-27-2016, 03:41 PM	#3
Captainjz16 Registered 0 Rep 4 Posts Drives: 2006 E90 Join Date: Oct 2015 Location: Florida iTrader: (0)	water pump and thermostat both replaced in 2013. i replaced the thermostat again in 2015 and 2016.
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10-27-2016, 08:55 PM	#4
PhaseP Colonel 1007 Rep 2,108 Posts Drives: 325XI Join Date: May 2010 Location: Earth iTrader: (0)	There are two coolant temperature sensors on the car, one is close to the oil filter housing, the other one is right up the radiator on the passenger side, at the junction where a coolant hose goes into the radiator. Did you replace both?
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