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Oil Pressure Sender Replacement
 
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Pelican Technical Article:

Oil Pressure Sender Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$25 to $60

Talent:

***

Tools:

17mm wrench

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

Oil pressure sender

Hot Tip:

Watch your knuckles it is in a tight spot

Performance Gain:

Working oil pressure light

Complementary Modification:

Oil and filter change

If you need to replace your oil pressure sender you will need to have a little patience. The sender is not expensive or all that difficult to get out but it is in a really tight spot. Give yourself plenty of time.

The oil pressure sender is located on the base of the oil filter housing at the very rear of the motor. There are two methods for getting the sender out. The first is from the bottom of the motor and the second is from the top. Neither provide great access and both are almost impossible to photograph. I have removed several components from the engine to try and get a picture of what you are doing. I would recommend removing it from the bottom and moving the starter motor out of the way to give you some more room. I have shot most of the pictures from the top so I can better illustrate what you are doing. Remember if you are going to move the starter you MUST disconnect the battery. Please see our article on starter motor replacement for additional assistance.

Begin by safely jacking up and supporting the vehicle. Please see our articles on jacking up and supporting your vehicle. Wear safety glasses whenever you work under your vehicle.

The oil pressure sender is located on the base of the oil filter housing (red arrow).
Figure 1

The oil pressure sender is located on the base of the oil filter housing (red arrow). Some people have success placing a long handled 17mm wrench down between the hoses and firewall to remove the sender.

This photograph taken from the bottom of the motor illustrates the sender (red arrow, behind the Allen socket).
Figure 2

This photograph taken from the bottom of the motor illustrates the sender (red arrow, behind the Allen socket). Remove the wiring connection first (yellow arrow). It just pulls off.

This photograph illustrates where the sender attaches to the oil filter housing base (red arrow).
Figure 3

This photograph illustrates where the sender attaches to the oil filter housing base (red arrow). You will not be able to see it as clearly as this.

Slide a 17mm wrench down from the top or up from the bottom and loosen the sender (red arrow).
Figure 4

Slide a 17mm wrench down from the top or up from the bottom and loosen the sender (red arrow). Once the sender is loosened you can finish unscrewing it by hand.

Make sure to get the old crush washer off the sender and install a new washer to prevent oil leaks (red arrow).
Figure 5

Make sure to get the old crush washer off the sender and install a new washer to prevent oil leaks (red arrow). Installation is the reverse of removal.


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Comments and Suggestions:
Blondii Comments: is this location the same on a 420 95 eclasse?
August 31, 2016
  Followup from the Pelican Staff: It should be similar, as long as they use the same engine. - Nick at Pelican Parts  
Bruce Comments: Hi i'm looking for the location and part for a oil sending unit for a 1993 Mercedes Benz 400 E 4.2 liter V 8 please send pics thanks Bruce
August 4, 2016
  Followup from the Pelican Staff: I don’t have that info.

Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
willyg Comments: This was very helpful. I did it from the top. Helps if you do an oil change/filter at same time to get the filter out of the way. Tricky angle, but a simple repair, once you get the thread started, Make sure the washer stays on.
April 9, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 

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