Ambient air temperature sensor

Tiny
RRFLORES66
  • MEMBER
  • 2006 MERCEDES BENZ C230
  • 50,000 MILES
Can you please tell me where to find the ambient air temperature sensor on our 2006 Mercedes c230 sport? The outside temperature shows 185 all the time and the check engine light came on. Car runs fine.
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Friday, August 23rd, 2013 AT 5:17 PM

4 Replies

Tiny
TY ANDERSON
  • EXPERT
The ambient temperature sensor is location on the lower portion of the front bumper more toward the driver side. Its is usually mounted the lower grille area and has a pointed cone shape. Inspect the electrical connector and wiring this sensor can get abuse from road debri and curb damage. As for the check engine light have you had the vehicle scanned for the check engine light (most auto part suppliers will do this for free), if so what is the code?

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers
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Friday, August 23rd, 2013 AT 6:23 PM
Tiny
GHILLS56
  • MEMBER
  • 2006 MERCEDES BENZ C230
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 78,000 MILES
My check engine light came on. Auto zone checked and said my ambient temperature sensor needed to be replaced. Should/could I order assembly from EBay and is it an easy fix? Do I have to take off grill to find sensor? Will Check engine light go off after I fix it? Thx
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Saturday, January 20th, 2018 AT 7:32 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Hold on. You took advice from a parts salesman. Diagnostic fault codes never say to replace parts or that they're bad. They only indicate the circuit or system that needs further diagnosis. This is especially true with this circuit. Temperature sensors have only one electrical component inside so failure is almost unheard of in any brand. It is much more likely there is a wiring problem like a corroded or stretched terminal in a connector or a cut wire.

Also, based on your comment about the grille, it sounds like you're looking for the wrong sensor. There may be one near the grille for an inside thermometer, but that isn't monitored by the Engine Computer and won't set a fault code or turn the Check Engine light on. You need the intake air temperature sensor that is part of the emission controls and fuel injection systems. It may also be called the charge temperature sensor. That will be somewhere in the fresh air intake hose or the intake manifold. It should be pretty easy to get to.
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Saturday, January 20th, 2018 AT 7:33 PM (Merged)
Tiny
AZSCOTT5000
  • MEMBER
It absolutely can be the sensor located on your grill near the passenger side fog light. It's in a vulnerable spot and gets knocked loose or even ripped off commonly. This causes the check engine light to come on. You may need the pigtail if the wires have snapped. All in all costs about $25 and takes 15 minutes to replace. Dont listen to some asshole who has never dealt with the problem and wants it to be something terrible. Cheap and easy fix. Good luck.
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Friday, December 14th, 2018 AT 5:13 AM

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