CL-Class (W216) 2007-Present: CL 500, CL 600

Engine light and P0128 code

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Old Feb 9, 2022 | 03:28 AM
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Joined: Oct 2021
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From: Milan, Italy
'06 Mercedes-Benz CL 500 (C216)
Exclamation Engine light and P0128 code

Hi guys, I've a problem with my '06 CL 500 (C216): engine light on with code P0128.

I know and I've read a lot regarding this code, and after some test I realized these considerations:
  • water lever in the reservoir is ok;
  • I've hot air inside the car, after a few minutes from a cold start;
  • I can cancel the error with the OBD scanner.
The problem is that the engine light turns on sometimes, mostly in the chilly morning with temperature around 0° C, but ONLY if I turn on the car and go to my work taking the motorway...after about a quarter / 20 kms, engine light ON...but engine temperature is ok, around 85°C.
If I don't take the motorway but I drive just some minutes in the traffic, the engine light doesn't turn on.
It's like a problem on how many minutes it reaches the correct temperature, but we are talking about minutes.
I don't think that it's a problem regarding the thermostat, because if I drive in the traffic or also in the motorway but after that period, I have no problem with temperature, or fan, or the heating.

However, I bought a new thermostat and I'm going to replace it, but I would know from you if you have faced a similar problem on yours CL.

Thanks in advance, I do appreciate your support!
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