P0128 error code
Thread Starter
Newbie
Joined: Jun 2014
Posts: 8
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From: Greenville, SC
2010 Mercedes E350
P0128 error code
Guys I have been getting the p0128 fault code. I have checked the antifreeze. I know this usually means the thermostat is faulty but the car isnt running hot. What do you guys recommend? Should I start by changing the water temperature sensor or only change the thermostat?
MBWorld Fanatic!
Joined: Jun 2015
Posts: 1,523
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
Here's a thread about it, maybe this will help some.
https://mbworld.org/forums/c-class-w...need-help.html
https://mbworld.org/forums/c-class-w...need-help.html
Thread Starter
Newbie
Joined: Jun 2014
Posts: 8
Likes: 0
From: Greenville, SC
2010 Mercedes E350
Also the car only has 36k miles. The car warms up just fine and the temp is 87'f. So I'm assuming the thermostat is stuck open.
Last edited by ofarrechea; Oct 13, 2015 at 10:20 AM.
Member
Joined: Apr 2008
Posts: 152
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From: Northern VA
2010 e350
I replaced my thermostat yesterday. It was kind of a pain because you need to remove the belt, one of the rollers, and then also you need to loosen the air pump. I was very paranoid about stripping out the aluminum holes.
Also I think some of the rollers or the tensioner is on its way out.
After replacing I had to clear out the code, it wouldn't go away on it's own.
The old one was stuck open and the car wouldn't ever fully warm up.
Also I think some of the rollers or the tensioner is on its way out.
After replacing I had to clear out the code, it wouldn't go away on it's own.
The old one was stuck open and the car wouldn't ever fully warm up.
Super Member
Joined: Sep 2015
Posts: 725
Likes: 189
From: Chicago area
2015 E400 and 2015 GLK350
I'm just now seeing this thread, but the lesson to be learned here is that typically automotive thermostats fail in the "open" position. They are designed this way so that when they fail, they do not destroy expensive engines.
We should be thankful that some engineer, long ago, designed these things sensibly. . .
We should be thankful that some engineer, long ago, designed these things sensibly. . .
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,143
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
I'm just now seeing this thread, but the lesson to be learned here is that typically automotive thermostats fail in the "open" position. They are designed this way so that when they fail, they do not destroy expensive engines.
We should be thankful that some engineer, long ago, designed these things sensibly. . .
We should be thankful that some engineer, long ago, designed these things sensibly. . .
I have had only two thermostats fail on my past cars and both of them failed closed.
The thermostat closes with spring and opens by the heat expansion of the wax that presses the "valve" open against the spring. The steel spring is not likely to fail but the heat expansion wax material in its compartment is meaning when the thermostat fails it likely fails closed. At least mine did.
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