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Pelican Technical Article:
Mercedes Oil Level Sensor Replacement

Steve Vernon
 
Time: 2 hour
Tab: $160
Talent:  
Tools:
13mm wrench, E10 Torq
Applicable Models:
C320 (1998-2004)
E320 (1998-2004)
S320 (1998-2005)
CLK320 (1998-2004)
SLK320 (1998-2003)
Parts Required:
Oil Level Sensor, Oil
Hot Tip:
Get the engine warm before you drain the oil
Performance Gain:
Proper working gauge
Complementary Modification:
Change your oil filter
 
   

   

Check out some other projects in this series: 

Need to buy parts for this project?
Click here to order parts for your Mercedes-Benz from our parts catalog.
   
      

     Your oil level sensor is located on the bottom of the oil pan, which means you will have to drain the oil in the engine to perform this work; therefore you might as well change the oil filter while you are performing this job to save you time and money in the long run. Please see our article on changing your oil and filter.

     Begin safely jack up and support your car. With the car safely off the ground you will need to remove the engine tray. There are six 8mm bolts holding the tray on, the rear two also help hold the transmission tray. If you are going to leave the transmission tray on, remove the rear two bolts first, lower the engine tray, reattach the transmission tray bolts, then remove the remaining four bolts on the engine tray.

     With the pan removed you will be able to see and access both the drain plug and the sensor.

     On the rear of the oil pan you will find the 13mm drain plug use a wrench and remove it. Remember the oil may be hot coming out of the motor so make sure you don’t burn yourself and try not to drop the drain plug in the container you are using to catch the oil. Always dispose used motor oil according to the regulations where you live. Most oil change shops or your neighborhood parts store will take your old oil and filter to be recycled properly. Once the oil has emptied reinstall the drain plug with a new crush washer, just so you don’t forget it later.

     On the bottom right side of the oil pan is oil level sensor. It is recessed up in the pan to help protect it from damage. There is a single electrical plug going into it. Squeeze the connector in and pull the pull out. Take care when unplugging it as it can get brittle.

     Use an E10 Torq along with an extension and remove the three E10 Torq bolts. With the bolts removed wiggle the sensor out of the engine.

     If the sensor is working but just leaking install a new gasket, if you are replacing the sensor it should come with a new gasket installed.

     Clean the area around the sensor opening well. It needs a clean surface so it can sit flush against the pan and not leak.

     Now you MUST refill your engine with 8 ½ quarts of oil. Again, you might as well change your oil filter now, as you are about to put in all new, fresh oil.

     Check for leaks and reinstall the engine tray.
Begin by safely jacking up and support your car.
Figure 1
Begin by safely jacking up and support your car. With the car safely off the ground you will need to remove the engine tray. There are six 8mm bolts holding the tray on, the rear two also help hold the transmission tray. If you are going to leave the transmission tray on, remove the rear two bolts first, lower the engine tray, reattach the transmission tray bolts, then remove the remaining four bolts on the engine tray.
Large Image | Extra-Large Image
With the pan removed you will be able to see and access both the drain plug (green arrow) and the sensor (red arrow).
Figure 2
With the pan removed you will be able to see and access both the drain plug (green arrow) and the sensor (red arrow).
Large Image | Extra-Large Image
On the rear of the oil pan you will find the 13mm drain plug (red arrow), use a wrench and remove it.
Figure 3
On the rear of the oil pan you will find the 13mm drain plug (red arrow), use a wrench and remove it. Remember the oil may to be hot coming out of the motor so make sure you don’t burn yourself and try not to drop the drain plug in the container you are using to catch the oil. Always dispose used motor oil according to the regulations where you live. Most oil change shops or your neighborhood parts store will take your old oil and filter to be recycled properly. Once the oil has emptied reinstall the drain plug with a new crush washer (yellow arrow).
Large Image | Extra-Large Image
On the bottom right side of the oil pan is oil level sensor.
Figure 4
On the bottom right side of the oil pan is oil level sensor. It is recessed up in the pan to help protect it from damage. There is a single electrical plug going into it. Squeeze the connector in and pull the pull out. Take care when unplugging it as it can get brittle.
Large Image | Extra-Large Image
Use an E10 Torq along with an extension and remove the three E10 Torq bolts.
Figure 5
Use an E10 Torq along with an extension and remove the three E10 Torq bolts. With the bolts removed wiggle the sensor out of the engine.
Large Image | Extra-Large Image
If the sensor is working but just leaking install a new gasket, if you are replacing the sensor it should come with a new gasket installed.
Figure 6
If the sensor is working but just leaking install a new gasket, if you are replacing the sensor it should come with a new gasket installed.
Large Image | Extra-Large Image
Clean the area around the sensor opening well.
Figure 7
Clean the area around the sensor opening well. It needs a clean surface so it can sit flush against the pan and not leak.
Large Image | Extra-Large Image
Now you MUST refill your engine (red arrow) with 8 ½ quarts of oil.
Figure 8
Now you MUST refill your engine (red arrow) with 8 ½ quarts of oil. Again, you might as well change your oil filter now, as you are about to put in all new, fresh oil.
Large Image | Extra-Large Image
Need to buy parts for this project?
Click here to order parts for your Mercedes-Benz from our parts catalog.
Bookmark and Share
Comments and Suggestions:
mikey Comments: trying to figure out on 2004 c230 coupe which sensor I need. You guys have two listed, one for code 803/804/805, and one for code 800/801/802/806/807/808/809

How do I know which "code" my car is?? price diff is about$100 between the two parts
November 6, 2014
  Followup from the Pelican Staff: I'm not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
nuvision Comments: Would this procedure apply to my 2002 C240 Base?
June 10, 2014
  Followup from the Pelican Staff: This tech article applies to:
C320 (1998-2004)
E320 (1998-2004)
S320 (1998-2005)
ML320 (1998-2003)
CLK320 (1998-2004)
SLK320 (1998-2003 - Nick at Pelican Parts
 
Ern Comments: It is different for 2000 E320 Wagon. To replace the oil level sensor, must remove the oil pan. Has anyone done this?
May 25, 2014
  Followup from the Pelican Staff: I have not. I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
Era Comments: I don't know if it is the right plat form but why does petrol get into the oil pan Samp and how can I resolved this problem
February 5, 2014
  Followup from the Pelican Staff: I would guess that you have a leaking fuel injector or fuel pressure regulator. - Nick at Pelican Parts  
johno Comments: Is it the same procedure for the .ml430
November 20, 2013
  Followup from the Pelican Staff: The procedure is similar but slightly different - Kerry at Pelican Parts  

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  Applies to: C320 (1998-2004), E320 (1998-2004), S320 (1998-2005), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
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