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p0128 error code 2010 e550

Old Dec 27, 2024 | 02:38 PM
  #1  
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2010 E550
p0128 error code 2010 e550

the check engine light came on and autozone says its code P0128 2010 e550

they says i need a new thermostat

i drove the car and it drives just fine,

the temperature got up to 87 C after short ride, so i dont really understand the problem???

i think this is a job i could probably do myself

autozone wants $217 for the part, but i notice it can be had for a lot less elsewhere

any advice on where to get one would be greatly appreciated.

thanks in advance

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Old Dec 27, 2024 | 02:50 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by miky2001
the check engine light came on and autozone says its code P0128 2010 e550

they says i need a new thermostat

i drove the car and it drives just fine,

the temperature got up to 87 C after short ride, so i dont really understand the problem???

i think this is a job i could probably do myself

autozone wants $217 for the part, but i notice it can be had for a lot less elsewhere

any advice on where to get one would be greatly appreciated.

thanks in advance
Your best interest is to buy trusted genuine parts, not the cheapest available look-alike thermostat. It will serve you well.
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Old Dec 27, 2024 | 03:32 PM
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W204 2010 C300 4matic Sport M272
I was searching around and see others that had that code and it was not due to a faulty thermostat.

Im not saying that its not your thermostat, just saying there may be other reasons. One was due to a low battery. Have you had the battery tested lately, how old is it?

The thermostat should open around 100 degrees C. When you start the car and start driving does the temp slowly rise to over 80 C, then around 90 C it should drop a little which is the thermostat opening.

If it takes awhile to get up to temp and you dont notice a small drop in the temp around 90 C then the thermostat may be stuck open, or faulty o-ring in there.

Im not sure which engine you have. On my M272 the Mercedes brand thermostat is stamped Wahler, so if I had to replace it i would just buy the Wahler brand which is less expensive than Mercedes branded.


Last edited by TimC300; Dec 27, 2024 at 03:36 PM.
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Old Jan 13, 2025 | 06:07 PM
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2010 E550
i bought the wahler, installed it, and the car is running fine and the temp gauge is moving as it should so i think i fixed it. used a little over a gallon of new antifreeze

not such a difficult job witht the wife holding a flash light aand the wrench to release the temsion on the belt to get the pulley back on

the check engine light is still lit tho?

how do i get that tuned off?

thanks again
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Old Jan 13, 2025 | 07:16 PM
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Originally Posted by miky2001
i bought the wahler, installed it, and the car is running fine and the temp gauge is moving as it should so i think i fixed it. used a little over a gallon of new antifreeze

not such a difficult job witht the wife holding a flash light aand the wrench to release the temsion on the belt to get the pulley back on

the check engine light is still lit tho?

how do i get that tuned off?

thanks again
Congrats on completing this engine repair


Now, use your scanner to reset the ECU calling the CEL... hopefully whatever fault will stay off
couple drive cycles may deactivate fault condition.
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Old Jan 13, 2025 | 09:35 PM
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2010 E550
i have driven it back and forth here and there a few times, the light is staying on, i dont have a scanner.

is there any other way to turn off the light?
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Old Jan 13, 2025 | 10:04 PM
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Originally Posted by miky2001
i have driven it back and forth here and there a few times, the light is staying on, i dont have a scanner.

is there any other way to turn off the light?
Get a scanner if you plan to keep the car!
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Old Jan 13, 2025 | 10:16 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by miky2001
i have driven it back and forth here and there a few times, the light is staying on, i dont have a scanner.

is there any other way to turn off the light?
Autozone is advertising "free code reading"... if you flash a twenty... you could get more traction ??


Last edited by CaliBenzDriver; Jan 13, 2025 at 10:17 PM.
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Old Jan 13, 2025 | 11:01 PM
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2010 E550
they will read the code, but they are not allowed to get rid of it. i tried o reillys too... i guess i gotta go ask that guy i know since its not turning itself off....
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Old Jan 14, 2025 | 01:16 PM
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19 GLA45, 86 560SL, former: 14 E550 4Matic, 09 E350 4Matic, 83 240D manual, 78 450SLC, 81 500SLC
Originally Posted by miky2001
they will read the code, but they are not allowed to get rid of it. i tried o reillys too... i guess i gotta go ask that guy i know since its not turning itself off....
Amazon Amazon
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Old Jan 14, 2025 | 01:25 PM
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And that scanner is $40 off the $169 price for only a few more days. Get one. You won't be sorry and you will save money by having one.
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Old Jan 14, 2025 | 01:45 PM
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W212 MY'14 M276-3.5NA @75kMi
Launch scanner

that scanner is the best reader for your car!!
It can email free comprehensive pdf reports to help diagnose remotely
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Old Jan 14, 2025 | 05:46 PM
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19 GLA45, 86 560SL, former: 14 E550 4Matic, 09 E350 4Matic, 83 240D manual, 78 450SLC, 81 500SLC
Originally Posted by Sunnyslope48
And that scanner is $40 off the $169 price for only a few more days. Get one. You won't be sorry and you will save money by having one.
This^

You will save much more in the long run.
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