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Pelican Technical Article:

MAP Sensor Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$30 to $50

Talent:

*

Tools:

Hands

Applicable Models:

Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

MAP sensor

Hot Tip:

Careful working with the hose

Performance Gain:

Working sensor

Complementary Modification:

Change the oil filter

The MAP sensor or Manifold Absolute Pressure sensor provides instantaneous manifold pressure to the ECU. This information is used along with the MAF sensor to determine fuel metering. Failure of the MAP sensor is usually associated with a rough running motor along with a check engine light. On some C350s the error code is P0106 but check to make sure on your own particular vehicle. While the MAP sensor is not that inexpensive it certainly is quick and easy to replace.

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows).
Figure 1

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows). Please see our article on engine cover removal for additional assistance.

The MAP sensor is located on the front of the left valve cover (red arrow).
Figure 2

The MAP sensor is located on the front of the left valve cover (red arrow).

Begin by unplugging the wiring connection (red arrow).
Figure 3

Begin by unplugging the wiring connection (red arrow).

To remove the sensor gently separate the two plastic clips on each side of the openings in the sensor (red arrows) and lift it up and off its mount.
Figure 4

To remove the sensor gently separate the two plastic clips on each side of the openings in the sensor (red arrows) and lift it up and off its mount.

Gently separate the hose from the bottom of the sensor (red arrow) .
Figure 5

Gently separate the hose from the bottom of the sensor (red arrow) .You can see how this hose is already starting to degrade and dry out so use care when working with it.

The hose connection on the sensor is ridged, which helps keep the hose in place but can be easily damage old hoses.
Figure 6

The hose connection on the sensor is ridged, which helps keep the hose in place but can be easily damage old hoses. Make sure to take this into consideration and check the condition of your hose. If the hose is ripped or cracked the sensor will get a false reading, and you will have a leak. Installation is the reverse of removal.


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