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Code P009a

Tiny
JROCK14
  • MEMBER
  • 2008 MERCEDES BENZ CLS550
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Hello, I have the car listed above w219 and I have this code P009a. I do not know where the ambient air temperature sensor is located on this particular model. Do I remove the tray under the engine? Please help, thanks.
Tuesday, July 10th, 2018 AT 4:59 PM

8 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

I have found three air temperature sensors for your car. Two are in the interior and one on the engine. I have attached the pictures showing their location and circled in red. Hope this helps and feel free to ask questions if needed. Thanks for using 2CarPros.
Danny-
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Tuesday, July 10th, 2018 AT 11:28 PM
Tiny
JROCK14
  • MEMBER
  • 19 POSTS
Okay thank you. I thought that it was behind the grille or something? This sensor is not for the engine temperature but the outside air temperature. Is it one of these or something different? As far as I know it has to be away from the engine in some sense so it can give an accurate reading of the outside temperature and all of those sensors seem to be something else.
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Wednesday, July 11th, 2018 AT 3:26 AM
Tiny
JROCK14
  • MEMBER
  • 19 POSTS
The temperature for outside is reading to high, it reads 110 degrees when it is only 90 degrees outside and it is throwing this code: https://www.pelicanparts.com/techarticles/Mercedes-W204/35-ELEC-Ambient_Air_Tempurature_Sensor_Replacement/35-ELEC-Ambient_Air_Tempurature_Sensor_Replacement.htm

I saw this but it is not my model so I was not sure if it is the same but here is the sensor according to the code.
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Wednesday, July 11th, 2018 AT 3:33 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

That would be the B10/4 or the second picture I attached in the previous post. It is located in the dashboard. Hope this helps and let me know if you have any other questions.
Danny-
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Wednesday, July 11th, 2018 AT 4:50 PM
Tiny
JROCK14
  • MEMBER
  • 19 POSTS
B14, it is located behind the front lower grille.
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Thursday, July 12th, 2018 AT 6:10 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Were you able to change it? Is the problem fixed? Keep me updated.
Danny-
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Thursday, July 12th, 2018 AT 3:51 PM
Tiny
JROCK14
  • MEMBER
  • 19 POSTS
I will be replacing it tomorrow.
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Thursday, July 12th, 2018 AT 4:44 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.
Cool, keep me updated.
Danny-
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Thursday, July 12th, 2018 AT 5:03 PM

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