The Oil Level Light is lit in the instrument panel after replacing the coolant level sensor on the overflow tank. Maybe I touched or washed something sensitive under the hood...? Maybe it is a bad sender? Maybe my wiring harness is kaput?

I cannot find the sender location or the wiring location, or a connector for it, and I have the Manual CD! Is it on the CD, if so where? I found the wiring diagram, but without component location it is pretty useless to me.

Please help!

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2004 E500 4Matic 138,000 miles

I think it's more likely that something got transposed behind the cluster.
'Quick way to check...unplug the connector to your NEW Coolant Level Sensor
...Does the Oil Level Light now go out?

In the first Pictogram #71 is the Oil Pressure Sender (on the side of the Oil Filter
Housing.

In the second Pictogram # 44 is the Oil Level Sender (inside the Oil Pan)

What I'm "Guessing" is that (from my DeCoding of your information proffered)
the wire for the Coolant Level Sensor has been substituted for the wire from
#44.
Behind The Instrument Cluster.
[I do not even know if that's possible]

Because,What you're describing is the Oil Level Light responding to the Coolant Level Sensor (AND that Ain't Happening...Even in America.)

Attached Thumbnails

   

__________________
'84 300SD sold
124.128

Compress Ignite,

Thanks for your reply and the clear diagrams. Where do you get those from?

Let me clarify: The Coolant Level Light works fine after replacing its sender. When the tank was empty it was lit, when I filled it the light went out. The Oil Level Light is on regardless of the coolant level.

Where do I look for the wire of the Oil Level Sender?

__________________
2004 E500 4Matic 138,000 miles

The oil level sensor is located down by the oil pump, obviously in a place where it can detect the level of oil in the oil pan. The sensor wire runs up on the right/passenger side of the engine block. You need to take off the lower oil pan to get to it, then a pretty easy job.

The oil level sensor, like the oil pressure sensor, alternator and starter, is not on the main harness but on the starter/lower harness which runs on the bottom right side of the engine. Lower harnesses have the same degradation problems as upper harnesses. If your recent work on the cooling level sensor was related it could be because you spilled some coolant on the lower harness. Or it could be just a random untimely failure.

http://mb.auto.pl/wis/w124/CD01/Engine/119/18-3300.pdf

deanyel,

Thanks for your reply and link. Not only did I spill some coolant, I followed it up by car shampoo and water, then a garden hose. I guess I have to wait until things dry out, then test the wire at component 2 in your link. That should determine if the fault is with the sensor or with the rest of the circuit. I am betting on the circuit.

__________________
2004 E500 4Matic 138,000 miles

deanyel.
Thanks!


http://www.detali.ru/cat/oem_mb0.asp?TP=1

ANY CHANCE the sensor wire got "Knocked Off" the connection post
down at the Oil Pan during Cleaning Operations?

__________________
'84 300SD sold
124.128

There is a GOOD CHANCE. As soon as the weather allows I will check the Oil Level Sensor Plug Connector and its harness. I found procedure 18-3320 "Testing oil level sensor" on the manual CD for diagnosing my problem. I have a love-hate relationship with this manual CD. It is pretty detailed and mostly unambiguous, but not searchable and oftentimes things are not where I would expect them to be.

__________________
2004 E500 4Matic 138,000 miles