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Outside Air Temperature Sensor Replacement
 
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Pelican Technical Article:

Outside Air Temperature Sensor Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$150

Talent:

**

Tools:

Philips head, flathead screwdriver

Applicable Models:

Mercedes-Benz 260E (1987-89)
Mercedes-Benz 300CE (1988-93)
Mercedes-Benz 300E (1986-93)
Mercedes-Benz 300TE (1988-92)
Mercedes-Benz E320 (1994-95)

Parts Required:

New outside air temperature sensor

Hot Tip:

Remove front left headlight to help with routing

Performance Gain:

Knowledge of outside temperature

Complementary Modification:

Clean behind bumper

There are three air temperature sensors on the car: one for the engine air intake, one for the climate control system and one that shows the outside air temperature in the dash. This article deals with the outside air temperature for dash display. The sensor is not cheap so make sure you check the dash unit before replacing the sensor.

The dash sensor is located in the lower left section of the front bumper.

Disconnect the ground strap from the battery terminal (red arrow) and place the cable (yellow arrow) where it can not accidentally come in contact with the battery while working.
Figure 1

Disconnect the ground strap from the battery terminal (red arrow) and place the cable (yellow arrow) where it can not accidentally come in contact with the battery while working. For more information please see our article on battery replacement.

The outside air temperature sensor is located on the right side of the front bumper, located just beside and below the front license plate (red arrow).
Figure 2

The outside air temperature sensor is located on the right side of the front bumper, located just beside and below the front license plate (red arrow).

Remove the plug from the front of the bumper (red arrow).
Figure 3

Remove the plug from the front of the bumper (red arrow).

There is a small plug located above the sensor (red arrow).
Figure 4

There is a small plug located above the sensor (red arrow). If you can remove this you can simply unscrew the Philips head screw attaching the sensor to the bumper and pass it through the hole. We could not remove the plug without risking damaging the bumper cover so we removed the four Philips head screws holding the license cover on (yellow arrows).

With the cover off you can get access to the sensor.
Figure 5

With the cover off you can get access to the sensor. Remove the Philips head screw (red arrow) and pass the sensor through the holes in both covers (yellow arrow).

Pass the sensor through the opening in the bumper (red arrow) and along the front of the vehicle.
Figure 6

Pass the sensor through the opening in the bumper (red arrow) and along the front of the vehicle. There are several small plastic clips that you need to remove to pass the sensor through (yellow arrows). It may be easier and faster to just remove the front bumper cover; please see our article on front bumper removal if you decide to go that route.

Remove the wire from the front of the frame, under the left headlight and along the fender (red arrows).
Figure 7

Remove the wire from the front of the frame, under the left headlight and along the fender (red arrows). Some people find it easier to remove the front left headlight; please see our article on headlight removal if you decide to remove it.

Follow the sensor wire to the fuse box and remove the fuse box lid (red arrow).
Figure 8

Follow the sensor wire to the fuse box and remove the fuse box lid (red arrow).

You will need to remove the top fuse section of the fuse box.
Figure 9

You will need to remove the top fuse section of the fuse box. Use a Philips head screwdriver and remove the six screws (red arrows, five shown). Even though the screws unscrew they will remain attached to the lid. The center screw on the front holds the fuse panel to the box.

Lift the fuse section up and out of the box section (red arrow) exposing the wiring below.
Figure 10

Lift the fuse section up and out of the box section (red arrow) exposing the wiring below.

Trace the sensor wires until you find the connector (red arrow).
Figure 11

Trace the sensor wires until you find the connector (red arrow). Separate the connector by gently pulling them apart.

Remove the top of the male side of the connector (red arrow) by gently prying both sides of the top away from the base.
Figure 12

Remove the top of the male side of the connector (red arrow) by gently prying both sides of the top away from the base.

Trace the wire ends for the sensor and push them back out from the base.
Figure 13

Trace the wire ends for the sensor and push them back out from the base. Insert the new wires in the same openings. Installation is the reverse of removal.

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Comments and Suggestions:
MD Comments: Thnks. I wll test the sensor soon and I wll document it; I wll post the results.
Rgds.
January 13, 2016
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
MD Comments: Hello,
Very informative. Is there a way to measure e.g. voltage drop, current, resistance, etc. the sensor itself ? Can you refer me to such a procedure ?
Thnks and regds.
January 11, 2016
  Followup from the Pelican Staff: Voltage drop can be tested on the signal side of the circuit. Resistance can be checked with the sensor removed, testing across the two terminals. We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It should have the wiring and possibly the sensor specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Bash Comments: Hi, I found your article very informative, full of illustrations. Do you also have this for the W202 C180 model? If not can you please make one and share?
May 1, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Jeff Comments: Any advice on where I might purchase just the LCD panel of the outside temp display?
Thanks, guys-
Jeff Harrison
February 17, 2015
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 

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