I noticed today that my 94 E320 oil pressure gauge is at 0 when idling and only goes up to 1 1/2 to 2 when driving. How can I differentiate if it's the oil pressure sender or the oil pump? I just change to oil last week.

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since you would hear the sounds of very low oil pressure in an engine clanking away at idle. The sender is quite easy to replace.

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Chip Johnson

You can verify the accuracy of the gauge by connecting a mechanical gauge at the oil pressure test port. Oil pressure sender is a common failure item, otherwise actual accurate oil pressure numbers as described means trouble.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

<< The sender is quite easy to replace.>>

Just unscrew the old one and screw in the new one?

__________________
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

That's pretty much it Edge. Should be threaded into the lower part of the filter housing, probably in a tight spot. Should take a 17mm open end to loosen. Getting the replacement threaded in isn't terribly difficult, it just takes a little finesse to get started without stripping the aluminum due to being in a tight spot. Cost is ~$70 for the sender.

Ooops...just noticed this was the 6 cyl. Not sure where the sender is located. Don't these have the filter top mounted?

edit: I just looked at my EPC for the 94 320. It appears the filter is mounted in the classic position on the side of the block. Sender is mounted at the bottom of the filter housing. I wanted to take a screen shot for you but I have no printer and my laptop wouldn't permit it...unless I'm doing something wrong???

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.

Replaced mine last year...five minute job.

Located just below the oil filter. Tight working area due to starter and some intake stuff occupying said space. A short wrench (7" or less) makes this an easy task...no room to turn a larger one!

Careful with the sender connection...the plastic has been subject to heat and age and is probably brittle...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car